Take some disposable money as your sole gaming money. Say $100.
If you win $100, put your winnings in your other pocket. Continue to play with the original $100. Go home when the original gaming money is spent.
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Sure they do. That's who Casinos get people coming back to spend money.
One guys wins big, 1000 pour money into it. The big winner is getting a fraction of what the Casinos is making.