Tipping is a way of life in Las Vegas. Limo drivers ($10–$25 per ride), valet parking attendants ($2–$5), cocktail waitresses ($1–$2), housekeepers ($2–$4 a night) and even desk clerks ($10–$20 if you’re looking for a better room) all ride the tip gravy train.
This also goes for casino dealers, who are paid little more than the minimum wage. Giving tips (or "tokes", short for "tokens") is smart, as happy dealers are your friends—they can assist you in a number of ways, such as by slowing the pace of the game in your favor. It's best to toke after a big win, for example by placing a bet for the dealer alongside your next wager. But don't bother if the dealer is rude or uncooperative—in such cases, it's best just to move to another table altogether.