Futurobet has an affiliate system which is generating a passive incomes for its users - I believe it's a good place to invest. Plus, you don't have to necessary play in this casino to earn there
Affiliate income and investment are different things. You can not invest into affiliate income, you can spend money on trying to get affiliates with banners all around the internet but that doesn't mean you will get a good return, it all depends on how you optimize your investment into getting customers and it is still a risky thing.
Investment is when you put your money into a casino as a bankroll for the casino and then every time people lose money you gain some as the bankroll of the house. They are vastly different things and not even remotely similar in nature. However, if you want to do either of those things both could return a decent profit if you do it right of course, I am not saying one is better than the other, all I am saying is they are not the same.