Just wanted to let you know they do give random complimentary upgrades from a value resort to a
DVC resort as part of YOMD. My SIL and her family had a reservation for our first night at WDW in April '07 at POP. She received a free upgrade to a studio at Saratoga Springs for that night. She and DW were able to get DVC to upgrade it further from a studio to a 1 BR villa. It had a great view of Downtown Disney from across the lake. She wanted to stay at Saratoga for the rest of the trip but neither she or we could come up with the extra money to do so.