There are people like that on ebay where they hold a grudge according to the feedback ratings. I guess if you are nice to them, they'll be nice back. Otherwise, it's like you say something bad about me and I'll say it right back to you. I had a neg. feedback too because of it even though the transaction was completed.
That was awhile back and I use Newegg now.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?