Well, in gambling there is always a chance to win, whether we believe in theory or not. Gambling is all about the game of chance though many believe it is greatly affected by luck. AS of those who got carried away, I think they believe in their theory too much that they forgot to control themselves resulting in regrets .
No surprise it's one hell of a drug. Even if we know we're about to lose a shitton of money, the appeal is always there