@zapjb Interesting post. My only bad experience as an eBay seller was for a used Lumia 640 cellphone, which the buyer claimed had a “very scratched screen” (it was not), and requested a return. I suspect the real reason was that the buyer didn’t bother to read the listing before clicking “Buy Now”, which clearly stated the phone was locked to AT&T, i.e. not unlocked. So my sale for only $40 including free shipping got blown up, and I ended up offering a $10 partial refund to close the matter–I guess the buyer figured that could go towards paying for an unlock. After my shipping cost and the eBay fees, I probably would have come out close just holding on to it until it was worth the same as your unsold Android phones.
As a somewhat occasional eBay seller, I was surprised to find out that eBay feedback is a one-way street; only buyers can leave feedback! An unreasonable buyer can really hold you hostage, including YOU paying for return postage on any return–regardless if you stated in your listing that buyers pay for return postage.