Despair from the fact that the deposit is almost lost, then hope when the bet increases and excitement, and when the increased Bet brings profit, returning the gambler's deposit + winnings, the gambler feels crazy joy, and continues playing. I do not know where else in life a person can experience such fast and bright emotions.
The festive mood is the reason why many gamblers admit that they return to gambling, not having the strength to quit it. Many say that they do not care about money, they want to hide and forget about reality among cheerful bright pictures and sounds, timidly hoping that the win is waiting around the corner. Our brain is chemical reactions, and if someone does not know why he wants to play uncontrollably, then this gambler should know that he has become dependent on the substances that our body receives during entertainment. But the trouble is that outside the game the world becomes dull.