It is better to invest I'd you want to make money over a longterm that you can actually spend on yourself later. Ha!bling you probably will lose everything and if you gamble sometimes only then you might win.
But how you don`t see that gambling is also some sort of investment, you invest in your luck and your skills. That sounds much better then to invest in some site that promise you fortune and in long term this sites turn out to be ponzi schemes.
I will tell you one thing, gambling is like all other investments, if you wish you investment to bring you profit then you need to be serious, to have big money, in gambling you have risks, but already calculated. Its all in how you approach to your investment, how much informations you have and skills to use that for your profit.