Just to correct you about roulette. Maximum win per field is 50 ETH, but you can win more than 50 ETH in a single round if you f.e. bet on RED + Number 23, those are two fields and your max win will be 100 ETH.
OK, I didn't find that in the FAQ, it just says you can bet between 0.0002 ETH and 70 ETH. What's the maximum for Bitcoin (just in case I ever run into it

)?