I think that we need to gain experience with different bets, different situations with losses and big wins, after which we will not be too interested and it will not cause us too much emotion, and when emotions are at a low level, then we can concentrate on more reasonable and balanced decisions. In addition, some can be helped by various things like watching how others win or lose huge amounts and imagining what would happen to us if we were in his place. Although it may not help some very much.