I don't disagree with what you are saying, however, it does seem that you skipped the most important consideration, which is investing within the boundaries of your discretionary income..., which also should mean that the discretionary income that you use is income that you don't need for 4-10 years or longer. which means that it is also money that you are willing to completely lose in the event that bitcoin were to go down rather than UP.
yes. very important before investing setting a budge base on the amount you earn as an investor is very good that will be a guide and it will also make someone no to touch the wallet where he put the invested bitcoin to till it reaches the target that such investor set. because if someone invest beyond the money, he supposed to then there is possibility that he will definitely touch or spend the money he already invested,
Sure no one invests in bitcoin or in any other kind of an investment with an intention of losing money, yet part of the way of assuring an ability to stick with an investment through the ups and the downs is to use extra money that you don't need for expenses.
Sure, there is no amount of money we can afford to lose, but the reason why people say they should invest the amount we can afford to lose is because of the risk that comes with bitcoin investment. There is the possibility of losing money, so we would rather use a small portion of the money we have in bitcoin investment because of the longevity.