I have an idea but I am not sure how good it would be for your project of casino.
What about giving bonuses/free spins to people who are unlikely to cheat them? You could give away some unique bonus codes to reputable Bitcointalk Hero & Legendary users of the Gambling section, these codes would be not intended to be transferred or used more than once per account, that way you would encourage some people around here to deposit and give your casino a try.