On the other hand, if there is another investor Mr C who decided to use the three method to invest in bitcoin with $100000, he uses $30k to lump sum right away, used $40k for his regular DCA weekly or monthly and use $30k to buy at the dip after10 years Mr C will have more bitcoin that the other two investors and will also be in profit
That is some pretty presumptive speculation that you are making both in terms of DCA being more profitable than lump sum and also you are failing to really provide specifics.
Your presumptions are not even correct, either, or maybe you just framed them badly.
If we have two people with an equal budget, then most likely the person who front loads in a 10 year timeline or even front loads in a 4 year timeline is likely going to do better than the person who defers buying through either DCA or buying dips, yet we cannot know, since we don't have enough details regarding when the guy bought.
We could have two or three people who might have something close to an initial starting budget, and A lump sums, yet B continues to invest into bitcoin, so that B ends up investing more and likely having a higher cost per BTC, yet B ends up with more BTC even though they cost him more, so B would be better off than A.
We also could have A with more money than B, so he is able to lump sum and B is not able t lump sum, and likely B is not going to catch up with A unless over the years he ends up investing more than A, and surely he would likely have higher costs per BTC too, yet we cannot even know that for sure because we cannot presume the direction of the BTC price, even though historically the BTC price has trended, up, yet we have had some extensive periods that can even last for several years that could end up allowing for BTC purchases at lower prices, which would cause the DCA'er to come out ahead of the lump summer so long as the lump summer did not also DCA but instead just invested one or two times and then if the BTC price ended up dipping from the lump sum buy amount, then the DCAer ends up buying BTC at cheaper prices.
Not easy to know these kinds of things in advance, yet part of the reason that DCAers tend to have better outcomes than lump summers who stop investing is due the DCAers persistence that likely ends up in the DCAer investing more than the lump summer, yet with the passage of time since the BTC price tends to go up, especially if we are considering investment timelines of 4-10 years or more, then the DCAer ends up profiting from those historical BTC price dynamics that are not guaranteed to continue to occur, yet have decently good odds of continuing to occur, especially since the strength of bitcoin's investment thesis does not seem to be getting weaker, but instead seems to be getting stronger, even if the steepness of the price slope seems to be getting less steep with the passage of time, yet even future steepness is not exactly clear, either.
There is a lot of truth that many folks do not have either an ability or a desire to lump sum invest into bitcoin or anything like that, so DCA allows for way better, reasonable and practical ways to manage cashflow in order to figure how much to invest into bitcoin each week, whether it is $100 per week, $10 per week or some other amount that they believe to be reasonably achievable and within their BTC investment aggressiveness levels.
That is true. In order to really make progress and to take bitcoin investing seriously, it is important to keep investing regularly, which is part of the reason that I consider that buying every week would be a good thing, even though surely some folks might want to spread their investments out to be less frequent, so there is nothing wrong with their following their own preferences.
Personally, it seems to me that almost everyone has a float, whether he is a newbie investor, an experienced investor or even if he has not quite yet gotten into investing.
To me, it seems that float is the amount of money that anyone keeps on hand when they might not be sure about how all of their income and expenses are going to work out for the month, so if the person projects out his income and expenses for month in advance, he will see that there are likely certain times of the month that he has smaller amounts of extra cash and other times of the month where he just has larger amounts of cash, yet those larger amounts of cash are already somewhat dedicated for expenses when the expenses come in or come due, yet the exact amount of the expense might not exactly be known until it arrives. The same is true for cash flows. A person might have some regular monthly pay amounts, yet there is even variance in the pay amounts of the regular monthly pay, and there could also be some other kinds of irregular pay that a guy gets for work or for things that he might sell, so maybe there are some months that some extra pay comes in or some months that the pay is less than expected, and so the float should be enough to cover those kinds of irregularities whether the guy is an investor or not.
Surely if a guy has more complications in his finances, he might have greater levels of float, and so he might purposefully choose to maintain higher levels of float if he already anticipates either intra-month shortages of pay and/or extra expenses.
I otherwise agree with your description of the emergency funds and reserves, and it seems that the emergency fund would be built first up to at least 3 months, but it can be simultaneously being built while still investing into bitcoin, yet once it is built at least to the minimal amount, then there can be continued building of it larger and/or building of various kinds of reserve funds, and surely the particular kinds of circumstances of an individual might affect how he might prioritize the building of various kinds of reserve funds and the extent to which he might maintain different categories within the reserve fund or just keep them all as a general category with the same priority, which seems less planned if a person is not figuring out how to prioritize his various kinds of reserve funds, yet surely not everyone is the same in regards to how much planning that they might do or how particular they might want to be when they are saving up cash for certain of their purposes.. or how long they might allow certain categories to build up and to stay in cash.. which generally tends to be a non-working category, yet folks sometimes will want their cash to be put into shorter term working categories, especially if they might be considering they they will need it 2-3 years down the road but they don't completely want to keep the value in cash for that long while they might be building it up.
I doubt that investing weekly does much to achieve any of the stuff that you are saying, except it just demonstrates a more active focus on buying bitcoin every week rather than spreading out such purchases to longer periods, and it does not even assure that you are going to get lower prices... it just allows for more activism in the BTC purchases, and some people might not want that... and so we choose our level of aggressiveness, including that some people might have a lot of other things going on in their lives and they may or may not be able to dedicate to buying bitcoin every week, so they might want to spread it out.
Personally, I think that setting up systems to try to buy BTC every week is important, since I believe that buying BTC should be considered as an important thing - yet I can see that other people might not feel that bitcoin is at that level of importance for them and they might even be spending money for various self-improvement systems and ways to earn more money in the future and other reasons that might improve their lives better than merely buying bitcoin, so they choose a more spread out BTC investment schedule. There are balances with these kinds of matters for sure.
Income and discretionary income are not the same thing, even though you might be describing something similar, but the concept of discretionary income is the amount of money that you have left after you account for your expenses. It is more accurate to say that we are ONLY investing from our discretionary income rather than just presuming that two people with the same income are the same or presuming that merely if someone makes more money or less money that he is able to invest in bitcoin or not. Sometimes people have discretionary expenses too, so if they cut some of their discretionary expenses, then they end up having greater discretionary income (more money available to buy bitcoin). Of course a person who chooses to spend 100% of his discretionary income on buying bitcoin is likely going to end up getting himself into trouble due to miscalculation of his expenses or even sometimes realizing that he needs or wants thing, so sometimes even within discretionary income there could be things that a guy wants to be able to buy from time to time or to prepare for some extra discretionary expenses through the month like going out to eat, drink or go to a movie. and so if he has spent all of his discretionary income on bitcoin, he might create some worse existence and stress for himself and perhaps even get into a position that he ends up having to draw from his bitcoin because he did not lessen his level of BTC buying aggressiveness.
Yeah but still. A more experienced investor is more likely to get used to buying BTC regularly, and also have certain systems in place in terms of how he is prioritizing various kinds of funds that he has. New investors might still be building various systems, and so for example, a brand new investor might already have systems in place in which he tends to have 2-4 weeks of extra cash, but when he gets involved investing into bitcoin, he should come to realize that it is going to be to his own advantage to build up his back up funds to be a minimum of 3 months (which would be emergency funds), and so it could take him 6 months to a year just to get his various kinds of back up funds into a good position, so for example, if the guy earns around $2k per month, but his expenses are around $1,500 per month, then he ONLY has $500 to work with, and if he ONLY built up his emergency funds with that extra $500 per month, it would take him 9 months just to get up to $4,500 (which is 3 months expenses), and if he chooses to invest half into bitcoin and the other half into his emergency funds, it will take him 18 months to build up such emergency funds.. .that is if everything goes well and as planned.. and if there are set backs, then it could take longer to build up strong finances and cashflow management and to figure out some kind of a way to balance how funds are being used and how much funds are being kept on the side for back up funds, whether emergency funds or other kinds of reserve funds.