Incident One: the "Princess Mononoke" DVD was not as indicated in the picture or the illustration, it was not the genuine US Miramax release, it was a cheesy cheap overseas import. This seller will accept a return, but I'm out what I paid for postage, plus the return postage.
(On the rare occasions, one or two, in which I have offered a refund to an eBay buyer, I refunded the shipping cost, plus reimbursed them for the return shipping. Here's my advice to you if you choose to pursue sales on eBay: if you're making a choice between "being nice" and "making money," choose "making money," because "being nice" don't pay the rent).
Incident Two: I inqured via email, as directed in the listing, for shipping charges to my ZIP Code. The seller provided a quote. After the close of the bidding, and after I had sent payment, including the extra shipping charge quoted, the seller notifies me that they need an additional $15 for shipping, "because the amount sent does not cover their costs."
(Many times I have underquoted on shipping. I have never requested additional shipping fees from a buyer beyond the original quote. The price quoted is the price, it's not right to change it after the fact. But hey, you can be "fair," or you can make money. Go with the money, nobody gives a rip if you're "fair." Oh, and, get a postage scale.)
One more thing: I've noticed that sellers no longer post feedback until they have received positive feedback from the buyers. In my thinking, the seller should post feedback immediately upon receipt of payment. The buyer's obligation is to pay promptly. Once the buyer has paid, his or her obligation is complete.
I think the eBay system is gradually falling apart.