You are bad for starting a new tipping thread, but as to the actual incident in question: You don't need to tip when you win jackpots where the only condition is you being there in the first place. It's different than being at a poker table, where you're depending on the dealer to make the game run in the first place. If you're going to chip someone, though, chip the floor or cardroom manager. It's +EV for future trips to the pokerroom and often results in better seating, etc. And they remember your name, which always makes me happy.