I truly adore stake due to their contests, they really well cooperate with their community by giving them opportunities to earn more money than just gambling. From what i know cryptogamble.com has pretty nice affiliate program for their users so they can have some passive income instead of having profits (or not) from gambling.

I also can recommend vegas casino, they have really nice support team and a renown. Usually people are praising it, instead of complaining - they start complaining when they lose a lot.