Microsoft love making money from this I bet. Even at a discount, I still think it's not worth it. Sure there's probably a lot of resources required to change it over but this is something they should allow you to do for free maybe no more than once per year, per account.
Why are you moaning? These are "promo" copies meant to be like that. It's to stop you lot selling them on and when they look that ugly, you'll probably have a hard time.