I'm thinking what's the house edge for the games you are talking?
The higher the house edge, the more the risk of losing soon will be experience, and I would say it will just a matter of time before someone really lose his money in a luck based type of games, if you want to win in this game, go big and don't gamble longer.
Of course, that's why lottery is very profitable for the owners or the operators, but here's what will happen to you if you win, you will end up a winner because we are talking of millions here and you'll surely not gonna gamble that again as that's a life changing win.
Don't get me wrong though, I am talking about accounts having a profit but not that much of a money that they can live with it. It is just amazing that with years and years of them gambling, they still have a profit even though the chances of losing is high.