Just want to respectfully disagree with some other posts. You can book the 40% off deal if a postcard comes to your house, even if the name listed is not you. I know cause I did it. After reading a lot of other posts, I called and said I wanted to book a room with the discount I received on a postcard. They asked me the name and I told them. It came addressed to a friend of mine who was on a reservation when we went about 3 years ago. He doesn't and never has lived with me. She said hold on while I check with Guest Services to make sure you can use this PIN. And while we were on hold, she priced out the vacation I wanted. Then she talked to Guest Services who said yes, as long as that PIN came to my household, anyone in the household could use it.
Then I got MK Tower at Contemp for $258/night. Yowza!
So if someone tells you no, tell them to check with Guest Services, and if they refuse, call back and talk to someone else.