Of course, almost every gambling site has bug bounty.
Fortunejack payed me 0.07btc(if i recall correctly) for bug in slot, i couldn't raise bet with "+" button, i had to click on max bet and than lower bets.
Lets say someone were to find a glitch how would that person go about proving the glitch exists without getting stiffed by the slot company?
I think it is in every casino's interest to give bounty to its users for finding bug. Don't you agree?