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I think that a lot of people like to consider DCA as a fixed dollar amount, and there is nothing wrong with that, especially since there can be a lot of conveniences in terms fo having a fixed dollar amount, whether weekly or some other period of time... set it and forget it kinds of ideas... though I also do not like automated DCA, even though sometimes automated could be way more convenient for people so they do not have to remember to do it, and they may well be busy at certain periods and forget to do their DCA manually.
Indeed the automated DCA do actually seem like an amazing approach as it simplified the whole DCA process and make it a lot more convenient, especially for those who often have a busy schedule and could forget to buy sometimes, but I still understand your reservations about the automated DCA, because despite the convenience it offers, it can prevent one from staying engaged and informed about your investment, which is really essential for the investment as need may arise to make certain adjustments.
Manual DCA on the other hand helps one to give the required time and attention to their investment and help them stay more connected and also make the necessary adjustments where and when required.
Although this isn't always the case, because even with the employment of the automated DCA, one could still find to to regularly visit his investments and still make all the necessary changes and adjustments when needed as automated DCA can only kick in when the investor is super engaged with other activities, too engaged that he either forgets or is deprived of the time to DCA for that week or month.
I don't have any problem with the idea that some folks earn very low amounts, such as $100 per month or maybe even lower, yet I have some difficulties imagining scenarios in which persons at those same levels would be ready, willing and able to invest 80% or whatever into bitcoin.. That hardly makes any sense absent some further explanation, as I suggested some explanations in which a person could have some ways of getting food through farming or services or otherwise having various expenses paid for in terms of lodging - but at the same time, even if some folks might have some really strange circumstances, those do not make very good examples, unless we explain the circumstances, and another thing that I already mentioned several times is that a lot of people (whether poor or not) have really difficult times even investing and/or saving 10% or more of their income, so when we are coming up with examples that are presuming sustainable abilities to invest even greater than 30%, then I am going to question those circumstances, including questioning if they are either sustainable, long term or maybe just trying to play the wave by gambling and using money that you cannot afford to set aside for 4-10 years or longer, which are the kinds of longer term strategies that we are aiming to discuss in a thread like this... . .
I'm also having a hard time trying to imagine someone who earns $100 investing over $80 or more in bitcoin, I mean what's he going to do with the remaining $20 or less, how's that going to cover other expenses, but well except of course the person have already stashed up more than enough money for emergencies as well as his reserve/float. (Especially his reserve) Because that's the only way $20 dollars should be enough to cover for other expenses until his next paycheck.
But sometimes, regardless of how huge a person's reserve funds are, investing 80% of one's income could still be considered to be quite an aggressive wsy to accumulate bitcoin, especially for someone earning such a low amount of money.
Just as you stated, a lot of people struggle to save up to 10% of their income, regardless of their income level, so investing 80% and having 20 left could be pretty much challenging for such a person to be able to allocate it appropriately.