We have said it several times without number on this gambling board that gambling is not for making money. Gambling should only be for fun.

Or let me put it this way. If you want to gamble, either for fun or to make money, do not use more than 1% to 5% of your weekly income on gambling. The recommended percentage is 1% but I do not see 5% affecting me. So if you can not go more than 1% of your weekly income, do not go more than that.
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Your latter statement makes more sense to advice to more gamblers than saying just a simple, gambling should only be for fun.

Treating gambling for fun is not for everyone. That fun might result into worst since losing is not fun. While these people saying they are gamble for fun, they don't realized that later on, they are already building up the idea of chasing all those losses. At first they are gambling for fun, but they are now slowly falling on the trap of gambling which later on they won't able to control anymore. Even rich gamblers are having such emotional stress when losing big, what's more for casual gamblers who treats gambling for fun.

As much as possible, even how people put up a percentage of their income on gambling, always try to be responsible at all times.