Sorry you got the run around, perhaps someone new since even when I call up about my Mom's offers and she is very much the low roller, they tell me outright what the offer says. Unfortunately they only have X amount of comp rooms per offer and they tend to book up fast at V/P. Sometimes they become available at the last moment too due to cancellations but if one already has a nice comp room elsewhere then I don't suppose it's worth checking back.
A lot of people don't rent or drive their cars to Vegas so won't care about the parking fee that M-Life properties is going to start. As far as I have read so far it's not clear if it's $10 a day and you can switch from property to property or if it's $10 a day at each property which really would be a pain. While Cosmo has said they aren't going the way of the Parking fee I think we'll see them change that policy once the new Arena opens in April and they see people going to those concerts trying to park at Cosmo for free and filling up all Cosmo's parking spaces instead of paying for parking at the Arena which I suspect is one reason MGM decided to charge for parking at their properties. There's been a lot of speculation that CET Properties will follow and also charge for parking in the future too.