I try to avoid ebay entirely but I confess that I occasionally do succumb. However, I have completely given up on feedback. Too many times I have received retaliatory negative feedback in response to my honest usually neutral feedback.
I have received negative feedback for declaring with neutral feedback that a seller sold me a trumpet mouthpiece that was so crushed as to make it unusable. His defense was that he didn't think it would cost very much to make it round again. I received negative feedback for pointing out with neutral feedback that a wind up clock, that I specifically asked if it worked, did not work at all but according to her it did in fact wind! I received negative feedback for pointing out with negative feedback that what was listed as a straight razor case was in fact a cutlery case that did not remotely match the listed dimensions and did not work for straight razors.
I believe that so many people have been too afraid to give honest feedback in fear of retaliatory feedback that the feedback scores on ebay are meaningless. For that reason, I no longer participate in it.
PS. I have only been banned once. That was for informing a seller, NOT through feedback but instead personal communication, that the black thong she sold my wife lost ALL of its black coloring the first time it was hand washed in cold water with Woolite in the sink. I actually liked it better with its new silver color but I thought the seller should be informed of the color instability of her product. I was not angry. I did not complain or ask for a refund. Her response was to call me a liar and to ban me. It didn't exactly hurt my feelings but it did cause me to leave her neutral feedback. Of course she responded with negative feedback!