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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.
How do you know that gamblers withdraw most of the money from the casino? As per the surveys and my personal research, I think most of the gamblers will keep the money in their gambling account (casino) as they have to gamble daily and they don't bother moving them out of the casino. Another group of people believe that if they move the money in and out of casino on daily basis or frequently, it will not only add burden on them but at the same time it may add unnecessary withdrawals fee.
While depositing in the casino may not be that costly but withdrawals can be burden if the casino charges high transactions fee. Still I think one should not keep big amounts in the casino.