Why does no one buy 10-20 coins? and do not keep them in a long time. I have been working this way for several years and do not have much capital loss
Because you have to understand that not all of us here on bitcointalk have been in the cryptocurrency space for years. Some of the members here(especially the ones asking these kinds of questions as OP) have only been here since the bull market December last year; hence a lot of them are in panic mode because they've lost a significant percentage of their initial investments.