You seem to be forgetting how easy it is to salt the internet with false reviews, false twitter comments, false facebook posts, etc. There are companies out there that will happily do thousands of the things for you for the price of a cuppa. So just because there are "comments" out there saying people got their stuff back, you would be a fool to believe that 100%!
Darren's comment about the secondary payload in the decryption is about the only reason I can think of for them to provide any sort of file decryption. So if there are REAL comments about them actually decrypting the files, I would almost bet on it that those PC's are now owned in one way or another by the pricks who created this virus.
So once again, why would you pay?