Its not primedice for me, because they are only focus on dice gambling games. How about the biggest sportsbook in the world. Bet365, Bovado, etc. The aforementioned sites are few of the biggest gambling sites in the world.
did you see the whales there betting tons of Bitcoins? Haha as far as i know Primedice is the richest gambling sites tho they have problem on withrawals now.