When I was new to crypto investing, this was the method I usually followed. The saying "invest as much as you can afford to lose" gets forgotten after a while. Someone who trusts Bitcoin and says they won't use their own money for a long time will invest more than they can afford to lose. Someone who starts investing regularly will also invest more than they can afford to lose. This is usually the case. Because when they buy small amounts of crypto, they don't care much about the money, but these small amounts grow over time.
Very often that advice is ignored because as we know the main goal of most traders is to obtain profits, and the bigger your capital the bigger your potential profits can be, so instead of just investing what they can afford to lose those people prefer to take their chances and boost their profits, not realizing that they could be boosting their losses instead, while at the same time the more money they put in this market the harder it will be to control their emotions and the easier it could be for them to make a mistake.