When I'm considering buying from sellers with a FB score below 99%, I always check with
http://www.toolhaus.org.
On their site - a real public service, IMO - you don't have to sort through all the seller's FB to find the negs. Merely by entering the seller's eBay ID, you can get just the negative feedback, along with any seller responses, of course. Sometimes the responses are more enlightening than the complaints - they give you a sense of the seller's attitude toward their customers, whether it's positive or negative.
EBay could provide FB information in the same format; the fact that they don't is a good indication how pro-seller they really are. In fact, sometimes Toolhaus has to close down because eBay makes it difficult for for them to get feedback information.
Clearly, eBay does not want you to have FB information in a format that might discourage you from buying except from the very
worst sellers. Caveat emptor!
Diddy