If you do spend it what do you spend it on and why ?
If you don't spend it what do you do with it ? Do you gamble more ?
I guess not all people that will play gambling just for fun will use their winning amount in gambling again. It is also depend on how people use their money or how they spend money for their everyday life. I think what you've said is vice versa of the result. some people win in gambling use their money in gambling again and some people wins in gambling just for fun is just use the money in some other stuff and not to gamble again. That is just my opinion.