Why do people play poker for money? Why do people play in casinos when they know statiscally they are going to lose?
I have some familiarity with this phenomenon, having lived with a compulsive gambler. The answer is that they are delusional and they do not know that they are going to lose. On some level, they will tell you that of course the odds are against them, but they will assure you that, in their particular case, they managed to get lucky and be slightly ahead. Of course, they're wrong, but they do talk themselves into believing that the one time that they won a 500 dollar slot jackpot offset the other sixteen hours of play.
If there happens to be at least some tiny bit of skill involved, as in blackjack, they will convince themselves that other, suckers, lose money because they don't know how to play, but that they are beating the house.
It's quite daft, but they do it. I have no doubt that there are Chess players who do it too.

Why do people play poker for money? Why do people play in casinos when they know statiscally they are going to lose?