Whatever you are saying is quite easy to say, but trust me its extremely hard to execute.
Then gamble on sites that use virtual currency and has no value at all. Again, if you start winning, you will no longer gamble for fun rather to gain profits.
Those goals are the real problem. People starts to gamble more after losing to reach those goals!
You slowly start to increase those limits without even realizing and eventually you become an addict.

What I am trying to say is that, there is no such thing as gambling for fun. If you want to do something for fun, there are plenty of ways other than gambling.