I counter that everything is not returnable. eBay has and will revoke your coverage under their eBay Buyer Protection program. This actually happened to me.
I was buying a lot of raw WD comics on eBay. If something came in not in grade due to nondisclosure or poor shipping, regardless of whether the seller offered refunds or not, I contacted the seller and told them what happened. All of them proactively apologized and offered a partial refund for me to keep the book or full refund for return.
Except for one seller. He posted a WD #7, NM no refunds BIN for something crazy low like $30. When it arrived, it was creased down the length of the book (it was shipped in a simple bag and board in a manilla envelope). When I contacted him about it, he said sorry, no refunds, what do you expect for getting a good book so cheap (keep in mind, this was not an auction, he set the BIN). We went back and forth and it went nowhere, so I filed a claim. eBay paid the claim, but promptly suspended me and removed my protection under the Buyer protection program, saying I was requesting an inordinate amount of refunds and pressuring the seller into doing so. Even when I pointed out to them that I never initially requested a refund (only in the last case), that the solution was always prompted by the seller and photographs were always provided as proof of damage.