I'm not surprised that ebay sided with the buyer. They always side with the buyer as a matter of reflex. It has to be pretty bad for them to take the seller's side in any dispute.
I still use them. I don't like many of their practices, but they are an available market place. Their rules, their place. For gun stuff I prefer gunbroker. Their fee structure is better too. For some other items, ebay is the best place, so I still go there.