That's strange. I've never had anyone ask for a partial refund, but I've had a few complain really loudly, then stop when I told them to send it back for a full refund.
My attitude did bite me once - I sold a very valuable tintype for the opening bid of $1,000 and was quite disappointed. The buyer sent me a nasty email, BEFORE I shipped it, saying that it was an obvious fake, and that he had talked with experts. This was back before ebay put all their energy behind the buyers. So he ended up with a great deal on a rare piece, and I got screwed, but my overly-large ego was still intact.
