You can get comps at more then one casino. There is the MGM players card. You use this card at MGM,Bellagio,Mandaley Bay,The Mirage,Monte Carlo,New York and a couple others I can,t remember. So any time you play at any of these places the comps all go on one card. The second major card in vegas is Harrah's Players Reward card. You use this at Bally's,Harrahs,Caesars,Rio,Paris,Flamingo And a couple of more I think. When you use these cards you get points for anything you do in there
casinos...Ex. Any gaming table(
blackjack,Craps),
slots and if you eat at one of there resaurants you also earn points that you can later use for free rooms,dinner and such. All the rest have there own cards-The Venetian,Wynn, Binions and such. Most offer a small incentive to join. You can check out the MGM card @ playersclub.com and the Harrah's card @ totalrewards.com