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I think the problem most of the gamblers when they are winnings is, what is the right amount to stop once winning, usually they didn't notice that they are losing already after winning an amount. It's either they are getting greedier or unable to tell when is the good amount to stop, usually when I notice that I am winning, I will withdraw my 85-90% of all my total money from the site and I will leave the remaining 10-15% to play with, so if that made me earn more, the better but if I ended up losing, then I already managed to secure my profit.
I think many players withdraw up to 85-90% of their winnings because they don't want to keep the money there. They use the rest for necessary bets, such as football matches.
This goes back to human nature, which is easily forgetful when they're enjoying themselves. They shouldn't complain when they're having a bad day.