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I think there are only two method that I know of which is lump sum buy and the DCA method. You mentioned buying the dip but this is also a lump sum buy that is done when price retraces after an upward movement. It is different from buying using the DCA method because it involves an instant order whereas the DCA is a continuous buying process that is done weekly or monthly as the case may be. Maybe there is further distinction between between buying the dips and other forms of buying that is done at once for which I consider less important so as to avoid memorizing too many things. Maybe for academic purposes, such distinction might even become necessary and there is nothing wrong about it.
A combination of both methods is possible but it requires someone with experience and discipline to do effectively. I will not recommend that for a newbie to avoid being emotional about the whole process, rather I will suggest focusing mainly on the DCA method that is easier to follow and produces outstanding results when followed dutifully. However, no matter what method is adopted, some level of effort is needed to be able to follow such method with a sense of responsibility.
Just because you do not recognize and/or appreciate the practicality of buying the dip does not mean that it does not have its place and/or benefits.
For example a brand new person could come into bitcoin right now, and he already knows his budget. He has $9,400 that he can buy bitcoin, right now and he also has about $2,600 that is going to be available over the next six months. So that is $12k over 6 months.
He could buy $9,400 right now at $68,300-ish, and then just DCA with the other $100 per week over the next 26 weeks, or he could set aside some of his $9,400 to be included in his DCA amounts or to set some of it aside for buying on dips.
Let's say that he decides to lump sum buy right now $4,700 and then maybe he sets up 17 buy orders every $1k dip from $67k down to $50k, so each of them would be right around $276.50, and so they would be buying on the dip if they were to execute, and if they do not execute and the BTC price moves up rather than down, then maybe after a certain time, he might choose to remove those buy orders or maybe he moves them up. to higher prices (but they would still be buying on dips.. and whether that is practical or useful might not be agreed about whether that is a good idea rather than just lump sum buying and/or adding to DCA... and the mere fact that someone wants to employ that third technique makes it a valid technique even if it may or may not be one that is as effective as other techniques.. in part depending on what the BTC price ends up doing, which is not very knowable in advance.
On the other hand, not all rich folks have good habits, so it could well be the case that poor people are able to catch up and even pass up some richer folks.. but sure, the poor folks still have to figure out ways to have disposable income, so it could well be really difficult for a poor man who is ONLY able to figure out ways to invest $10 per week into bitcoin to catch up to someone who ONLY sporadically invests $100 or $1k into bitcoin - but still the guy investing $10 per week is still doing better than the similarly situated guy who is not investing at all... .. and so yeah, we might choose ways to compare our own bitcoin investment performance to others or to compare our performance to other variations of ourselves, and there are likely going to be ways that the organized, persistent and consistent BTC investor is going to catch up, surpass and out perform other possible alternative scenarios.
Of course, it is impossible for a poor folk who is accumulating bitcoin with the same way a rick folk is accumulating because the amount that they will use to DCA weekly will have a big difference, and that is why the rich serious bitcoin investor will always do better than the poor investor. However, there is a way a poor bitcoin investor will be able to surpass a rich bitcoin investor smwho is not serious with accumulating bitcoin and he is buying whenever he likes be cause he feels that he has enough cash or cash related property or another assest which makes him feel that it is not necessary for him to invest in bitcoin regularly, consistently and persistently.
With time I believe that the poor investor might get closer to the rich folk in terms of how much is their total value or he will be on the same level of value with the rich folk. This is because bitcoin price increases overtime and it will generate more profit based on the size of your portfolio better than what the rich guy is depending on which is making him to accumulate bitcoin in a whimpy way. Bitcoin have given the poor an opportunity to become rich in future if only they can invest and build their portfolio to a certain level based on their discretionary income overtime.
Poor investors can't compete with the rich when it comes to investments. The reasons why those that have a lot of money are called rich is because of how they spend and how much in their bank account and both the assets they have. Rich folks spend more on investment, and they don't care whether their investment is risky or not, they only do it because it's risky, and they also have a passion for making more money. The kind of amount they put into investment is way too much. A rich folk could one day buy $100k BTC even if he doesn't know what Bitcoin is about. And one thing I like about rich folks is that they don't care to know what they are dealing with before they put money in believing that along the line they will know the whole things about the investment, and it will also motivate them to invest more.
The poor would like to make sure they know what they are doing before they put money on it because they believe that they know how hard they manage to get the money, so they won't want to risk it just like that without gathering knowledge or doing their own research.
Now let's keep the poor behind. The kind of advantage most rich people have is that even if the average person started investing in Bitcoin for 4 years with $100 per month (that's $4800 total), if the rich starts his/her investment in a week, he/she will invest more than what the average salary earner in just a day.
But IMO, I can say that rich investors are always busy with something else, so once they have a lot of bitcoin in their wallet, they might forget about accounting to get more Bitcoin. And if an average salary earner is investing in DCA, he/she will not be content with the kind of BTC he/she has because the figures might be too small for him/her. And if the rich investor is no longer accumulating but only holding for long because he has a lot (like 10 BTC), then the average investor might try and accumulate up to 1 BTC before he/she might relax a bit.
You make a lot of presumptions about poor versus rich, and of course, even within the categories there is going to be a lot of variance in terms of disposable income, other investments and even investment behavior - including considering whether we should assume levels of interest in regards to bitcoin to be the same or not.
Usually, when running any experiment between kinds of people, it is better to figure out which of the variables might be similar and which ones might be different, and if there are too many variables, then it makes it a lot harder to make generally sweeping comparisons and/or presumptions regarding how one might compare to another.
It might even be helpful in terms of what you are considering to be rich versus poor and perhaps starting out with something like disposable income and also a description of already existing investments. Those would be the main categories, then from there we might describe someone who chooses to be whimpy or aggressive in his bitcoin investment journey, and are we starting from now, or are we giving an example over a 4-5 year period of time (in which we have some BTC price data) that already exists.