What about restocking fees on merchandise returns?
Some of our longtime competitors charge a substantial (20% range) restocking fee on returned orders where the customer merely changes his mind or doesn't like the product when he sees it. Almost no brick/mortar stores charge such fees. These competitors don't have conventional stores (we do).
Even tho the sellers explain the restocking free, I'd think it would be an unending source of friction. Yet some sellers have had such fees for years.