If you book a room and don't play, then yes it will hit your ADT. That said, whenever I go to Vegas, I generally have at least 2 comped rooms simply because a fair amount of places require me to book a room in order to get the freeplay or other goodies they are offering (GN is a prime example). I'll usually get a room on the strip, one at a Stations property and one downtown. Then again, my play is enough to keep the rooms and some FP flowing, even when spread around like this. I always feel bad that some rooms are going unused, but at least it's less work for the housekeeping staff .

Personally, I would not be a huge fan of selling any extra rooms, simply because my name would still be on the room, and I would also get my name linked to the room buyer / occupant (no way I am not at least adding their name to the room). Bad things could happen to me if they did something stupid like trash the room, or if they turned out to be some kind of AP, or cheater, or just general scum bag.

I have given extra rooms away for free to friends and relatives, however....