If I hit a hand pay on video poker, I normally tip the slot attendant (not the supervisor) $20. If I hit a big one ($8000 or more) and they go through the trouble to get me a check or fetch markers, I tip more.

I don't really feel obligated to do it, but I get faster service that way.

And, if they told me a video poker machine was "hot", I'd laugh and explain random number generators to them.