When i said that an investors should invest what he/she can afford, i meant that if any investors that doesn't have steady cashflow and you can sell a land or you have money that you split into two, the other should be the one that you will invest into so i didn't include losing of money in Bitcoin because i know that with dollars cost averaging strategy you will not losing all your money.
And i totally disagree with you when say bitcoin as some sort of gambling that you shouldn't invest what you cannot afford to lose, once you are looking Bitcoin as a gambling believe me that you will not have the mindset to buying Bitcoin aggressively or investing in a long term investment but i want to put it to that with DCA strategy it will help you recover your money, so a really investors will not think of losing but to buy Bitcoin and build up his portfolio.
For me it is not too ethical if we sell something that we already have as our long-term assets such as land or other things to be forced to be in bitcoin. Although it may sound good to some people, for me it is an imposition because in the end we still have several options including getting money that can be set aside to invest without having to sell anything we already have.
Being in bitcoin is indeed very good and indeed there must be something sacrificed in this case such as our grit and confidence that must be maintained and make self-control so that we can reduce our extravagant life a little but it will not be too worth it if we sacrifice what we already have for a long-term process such as selling property or land that we already own.
Indeed, it is allowed because after all it is the choice of each in making a decision but it needs to be emphasized that pushing ourselves too much may not end well later.