The dealer in a charity tournament was suggesting to "remember your dealer" and such, so I tipped 5%, or $5.00 (directly to the dealer).
A couple days later, when I called to find how tips are handled I discovered that this is actually illegal in Michigan, so I'll not plan to do that again.
Instead, the suggestion is to present the tip to the floor manager.
This sounds like a loophole to me.
I'll probably look into the laws/rules on the day following my next win, so I'll probably tip nothing next time around.
I like the charity poker, but tips could actually do harm if/when someone gets busted for it. I was at a charity party once that got raided and the (excuse) for the police invasion was that simple little tip jar in the corner even though it seemed harmless enough.