I know there have been many "is it safe to buy AppleCare from eBay threads, but I wanted to double check, cuz it just seems to good to be true. If you buy AppleCare on eBay, and the number registers, what are the chances of your AppleCare being revoked? Could they are stolen serials that register fine, but when you go to get support, it's unuseable? Or if your number registers, it is 100% legit? I just want to make sure I don't realize a year later that my AppleCare is no good, and not be able to get it anymore.