Stake, primedice, playbetr, freebitco.in... these are all decent casinos which don't scam their customers.
I agree with you, you can also add sportsbet.. you see OP, we have a lot of good bookies here, you can trust them with your money, they'll not gonna scam you because they have built their reputation for a long period of time already, and surely they'll protect it by running their business clean.
These are the great gambling site today and they really offer a quality service but of course you can’t expect them to allow you to cheat the system if this is your plan OP, better not to try abuse the promotions as well because they can caught you and you might regret it once your account is block, better to just play alone than to have partners since for sure no one will trust you easily.