In my opinion, try as much as possible without investing. Because of my experience from my past, I feel that most people can not even grow their investment money, because of not being able to play properly. They all went to the money. But I do not know what some of the gambling sites offer at this time.
And where exactly did you do this investment? I am in profit in all the sites I invest in currently, (whether directly in bankroll or indirectly via dividend returns on casino profit). And what do you mean "not being able to play properly"? If you invest in a bankroll you don't even have to play.
And then you say you don't know if sites offer, but you said you had past experience. So which is which now?