Does anyone know if there is any kind of set rules on nightly room deposits at MGM resorts. I seem to get different answers on each visit. I know this deposit also acts as the house charge account so I'm sure the desk agents are pressed to collect it but I normally ask to opt out and sometimes they let me and other times not. Someone once told me that if the room is comped you're normally not allowed to opt out.. Anyone know if this is true?