When eBay started out, they were referred to as "America's Garage Sale." As they matured, they made a transition to being more of an online retail platform. What that means for the small scale individual seller is that you get to experience all the joys of being a retailer, including having to "eat" the occasional bad sale. This is what consumers expect from all retailers nowadays. It's great if you're Home Depot or WalMart, but kind of sucks if you're an individual trying to hold an online garage sale and expecting it to work like a garage sale.
This isn't to blame the OP in any way. It's just my observation of the business.