I think the biggest problem in gambling is the effort to chase their losses and placing more bet in hope that a win will cover their previous loss and this only keeps increasing the loss.I have myself faced this,previous losses always comes in my mind and in effort to cover that loss i loose even more.
I think it is a human nature that people are greedy and they think that they can chase their loses that honestly in the end you will lose it all..
For me my problem in gambling i just expecting to make a large profit but still now i can win in sports betting but i never experience to gain a large win..
We know it is made for fun but i think many people also are expecting for profit..