I know that at the Bellagio there's a poker rate where you get a discount on your room, you get a card I think that the poker room boss signs. Anyway, I've heard it said that one people who are responsible will sign the card for a certain fee.
Sorry to be somewhat vague I think that was as much information as I heard at the time, seemed a frequent occurence, anyways.
EDIT: Oops, didn't notice the question was about AC
Molina