Unfortunately I think I might end up with a negative feedback on Ebay as I'm dealing with a weird person.
It seems that your percentage of positive feedback is calculated not as an average of all your feedback ever, but just as an average of all your feedback for the past year.
So if I have 200 positive feedback comments but only about ten of them were gained in the past year, and someone leaves me negative feedback, does that mean my positive percentage will go down to 90%?