We arrived at Rio around 2am on a Monday night, we had 3 nights booked for a deluxe suite and it was already comped. There was no one in line at registration and 3 representatives available. We chose the Asian male late 20s-30s and did the $20 in between id and credit card. He took the $20 bill and placed it on top of the counter on his side, he asked if we had an preferences (up high, view, close to elevator) and informed us that they had alot of rooms available, but no upgrade. He was however very nice and we also had a couple friends who checked into another room earlier before us so he put us next to each other near the elevator.

No upgrade at all.
No comp, no nothing.
Wasted $40 for two rooms.

Gave clerk two $20 dollar bills.
Folded in half at the beginning of our check-in.

Was happy to accept but just checked us in.

Advise before you give tip to learn if you are getting upgrade or nothing. Studied this website before going. Live and learn. This does not work for everyone.

[Editors Note: Make sure you ask “if there are any complimentary upgrades available” when using the $20 dollar trick.]

Long line so I got who I got. Arrived around 5pm. I didn’t even ask to upgrade. Had my ID and CC ready (Disney VISA). I don’t think it had to do with the card. Got upgraded to huge suite with pool/strip views and whirlpool tub. I booked on Vegas.com for $80 and paid $32 resort fee on the trip. Maybe they could tell I had penn and teller tix and a reservation for dinner already?