So, I was playing the 1/2 at Ameristar last night, and sat down with $160. When I left, the same lady who chipped me in cashed me out at the player counter. As she noticed my winnings (clearly remembering what I came in with) she gave me a big high-five, congratulated me, and then tapped the "can." I never noticed it before, but there it was, a metal tip can (just like the dealers have) at the cash-out desk. What's the protocol here? Use a percent? Or a flat 5 dollars (on winning nights)? I was caught off guard and dropped two $5 chips in. She gave me a grin and "thank you," and that was that. On my way out I figured the $10 was about 4% of my profit (2.5% of my total take-home). Is that fair? I've never run into this before and am curious what the protocol is.