I've seen a few washroom attendants in Vegas. Some you feel like you don't need to tip...SOME feel like you need to. I enjoyed bottle service at Gold Lounge. GREAT SERVICE, VERY Attentive to all details while at the table!! They had a washroom attendant there that would offer you a shot of men's callonge (however you spell then word for men's perfume, tried to type that bloody word 6 times already!). The washrooms here were individual little rooms that entered into a small hallway where the attendant was. How much, and how often do you tip this guy? Also saw one at Brooklyn Bowl. He offered other amenities including smokes. Not sure if that was a pack of an individual - how much do you tip this guy?