Thanks for the answers. I just wanted to make sure it could be upgraded. I wouldn't expect them to credit me more than what I paid for it (but, I'm not upset... it was a good point)
A few years ago, we bought an AP because we were there for 9 days and it was so much less expensive that a hopper for that long. You are right, we went back down a few months later for four days and then 51 weeks later (just before it expired) for another 8 days. We really got our money's worth (if you don't count the air and hotel for all those trips).
I want to do that again, but so far, DH is not budging. He said he's not falling for that trick again! But, I'm holding out hope that he'll have a weak moment.
Thanks,
Chris