i haven't played anywhere other than tunica but i'm assuming things work similarly in most places.
it seems that if i want to become a skilled AP i need to be concerned with not becoming known. but if i want to take advantage of comps then i have to sign in with some sort of players card. to get a card i have to show a valid ID with all of my personal info on it. so it seems like i would be better off not signing in and not worrying about comps.
on the other hand, refusing to sign in and being disinterested in comps could be suspicious. so what does one do? sign in and hope that you can disguise your action well enough that the bosses don't notice, try and procure fake identification to sign in with, or just pay for your food yourself?