And you don't really "rent" the reservation. You sell it to someone who wants to buy it. You maintain ownership until they check in, but once they check in, they have control. So if they ask the guy at the desk if a one bedroom is available because they are only in a studio, and you have points available, you just might be selling them the one bedroom for the price of the studio. Or if they trash the room, you get to pay for repairs. Or if they cancel their credit card when they hit $1499 before it get billed to the card, you get stuck with the bill.