My wife used to run a small volume eBay shop, maybe 50 listings at a time. About once a month she would have to deal with outright fraud, and eBay almost always sided with the buyers. I'm talking about things like brand new items of clothing returned completely destroyed by the buyer---huge tears, burn marks, etc---and my wife would be forced to refund the purchase price and shipping costs. It certainly wasn't worth her time or all of the stress.