Talking about the amount of investment, it really comes back to each individual because he will do it according to his abilities, indeed the monthly amount is quite large and the average standard salary in several countries is indeed not enough for that, but if he has a good position in his job, he will definitely able to do it.
In my view, collecting bitcoins at a total price of $ 20 / day is of course an inappropriate strategy in my opinion, because it will take a lot of transaction fees which are quite hefty if collected, it is better to extend the purchase interval, for example once every 2 weeks or once a month with a total amount the same one.
For example $ 20 X 14 days (two weeks break) = $ 280, and he only makes 2 transactions to make purchases in one month, in my opinion this method is more effective and economical for buying bitcoin.
Someone can do without coercion in their minds to be able to buy at the nominal rate they specify because the direction of urgent needs makes the situation quite complicated for our finances, but we can do it regularly with a different nominal investment rate from week to week.
Previously I thought those who did long term would not be a problem for them if they missed a few buying periods due to financial instability. However, they will resume buying when their finances stabilize.
Well, and to be honest I also often recommend, especially to some of my close friends, to invest in Bitcoin according to their individual abilities. Everyone has their own financial problems and they also have ways to improve their finances. Actually we don't really need a lot of money to then buy Bitcoin if our finances don't support it, everything starts small, I mean someone just needs to be consistent in buying Bitcoin even though the purchase nominal is small but better than not, what they have to do is continue to consistently buy Bitcoin at least once a week and lo and behold, in the next few years they will feel a significant advantage from the results of their hard work in setting aside money for Bitcoin.
So don't be too ambitious to force something that is beyond our ability, even though we know the benefits are very large but we also have to see some of the risks that are in it, and do it with money that has a long term term to use.