To me it is still confusing, since in order to figure out if something is overly aggressive or not, we still need to start with figuring out what is our discretionary income, so you need to start by showing income as compared with expenses in order to show what is the discretionary income.  So from my point of view you seem to be assuming too many things, and sure you might be correct in some of those assumptions.

Another thing that I already mentioned is that if your emergency fund, reserves and float is already in place, then there would be no need to build them or have money for them because they are already there.  However, if you are building them up, then surely they get built up from the discretionary income, so that takes away from how much discretionary income that you would have left for investing into bitcoin.

Any prudent person would not decide how much to invest into bitcoin prior to knowing his discretionary income, even though you may well be implying that the amount selected is within discretionary income, while at the time trying to provide an example that is obviously over the top, but you should not get that extreme (or also unrealistic from my point of view), since like I already said you need to give some kind of numbers for expenses so that we know how much money we have, and if you are saying that the whole $1,500 is discretionary income because the expenses have already been taken care of, even that seems unrealistic even for a guy who might be living with his parents.  Everyone has some levels of expenses.

Another mistake that many of you are making is to presume that there are 4 weeks in a month, when the fact of the matter is that there is like 4.33 weeks in a month (remember 52 weeks in a year, not 48 weeks), so that makes a difference.