It is more and more common since eBay tilted the balance hugely towards the buyer.
I have sold things and had them returned for the following reasons:
– Pair of shoes. Both not the same colour according to the buyer. Complete waste of time and money for something that sold for less than a fiver.
– Jacket. Buyer tried to negotiate a discount because it didn’t fit the way they thought it should. Ridiculous.
It is not unusual for buyers to threaten negative feedback if you don’t dance to their tune. I can understand the seller’s attitude, but that is a bit unprofessional. People like Torchy and other folk selling bike stuff have been pretty good to deal with.
As a seller I don’t even bother with no reserve auctions anymore. I just stick in a price I’d be happy to get and start it there. State comprehensively if I’ll accept returns or not and let it run its course.