I tip 10%, but I play low buy-in tourneys, so my cashes are less than $400. I think if I was playing higher buy-in tourneys I would drop the amount I tip. Like I once hit a video poker machine for 5k, and I think I tipped 200, so the more I win, the smaller % I tip. The dealers don't make that much in tips on tournaments, so I feel the need to tip well because I get along with most dealers.