This is normal for greedy gamblers. You get more excited to bet when you’re in a winning streak, I think everyone does. The problem is, due to your overconfidence that you will consistently hit a huge amount, you tend to lose control of your funds, until you end up realizing that all your profits have turned into losses already, and you can’t do nothing about it but to regret and blame yourself, wishing you immediately cashout your winning amount. At least you learned your lesson as well.
I remember talking about this a long time ago. It is not always about greed, most persons are greedy despite the amount that was offered to them in the cashout but other persons are not satisfied with the offer, it is preference, they know they will lose if they dont cashout but they decider to leave it. So instead of saying generally greed is the problem. Make it clear that there are gamblers who will rather choose to watch the game till the end than to cashout, because they are in for the full money not the littler offer from casino.