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If a person wants to save money for something or have savings he simply limits his mindless spending until he reaches his goal.
If you can't control your emotions while gambling, you probably won't be able to finish the game after a big win and lose all your money.
Learn to leave the casino a winner, it is very important.The thing is that even if you have the strength to leave after a big win, it's not the solution, because you will be back the next day, or several days after, and what you will be doing then? I mean, knowing that you can win a big amount, will you be waiting for that, rolling and rolling, or, if not, when will you stop? And if you stop today, when will you come back?
I think the problem is more complicated, because when we say "leave the casino", we don't specify for how long: for today, for the week, for the month, or, maybe forever? I myself leave the casino right away after a big win, but only for today, and I know that I will be there next day, and will be playing with the same balance, and my win will be lost ater a month or two playing, but I don't mind because gambling for me is a good entertainment, not a way of making money.
I'm not saying, I never withdraw my winnings. Of course I do, from time to time. But I never save the money, rather, I spend it on various forms of entertainment. Imo, if you start saving your winnings or spending them on something useful for your household, you might as well be counting on them in the future. And counting on your winnings from gambling is a dangerous thing, that's what I think.