eBay can be downright tyrannical when it comes to their decisions, and they usually side with the buyers. The first warning sign I remember was a professional violin player that sold his old violin on eBay. The buyer claimed it was a fake, the seller was quite clear as to why it was not. At the end eBay, without ever seeing the item, refunded the buyer and told them to destroy the violin because it would be illegal for them to ship a fake item back.
If a buyer wants to screw you over you are screwed. Like buying vintage items to harvest parts to fix their own things and then return the item with the broken parts.