At rafflebit.com the FAQ states about the hash: "This enables you, the user, to verify that we, the operators, aren't monkeying around!"
I'm interested in learning how it does this! As far as I can tell, this isn't the case.

It doesn't prevent you from playing yourself and buying lots of tickets to make the jackpots big and then paying yourself. You know the winner before hand and just need to pay at the right time to win. Unless I'm missing something?