As what I can see from most gamblers they tend to chase their losses as what the OP has stated, coz they think that they can recover them by the next turn but in reality it's not that simple coz there are so many factors involved when you are gambling. I also agree with what you were trying to convey that too much expectation leads to disappointment, in all honesty those who expect too much specially in gamblinf ends up the most irritated, and I am speaking through experience as what I did observed from my neighbors who are already seasoned gamblers. I have even witnessed someone from my area who lost $500,000 in just a week of playing a game, and I didn't understand how such a person can handle such loss or is he still okay with it, it's just so unreasonable for me, if I were to be asked.
Ah, such a shame! I feel bad for the guy who lost $500k, but I don't have any sympathy for him since it was his own decision to ruin himself or lose such a big amount. He could start a pretty healthy business with that amount and live the rest of his life off of it, he could even gamble once in a while with the money earned through that, but he chose to gamble it away.
People need to stop expecting that they can earn more if they have a lot of money, it is the simplest way of losing everything that you have and there is no point in regretting later since what's gone is gone.