So this happened. I found a Buy It Now auction for a thing I'd been after at a very reasonable (but not stupidly cheap) price, so I bought it.
A few minutes later I get a message from the seller saying "oh dear, I didn't mean to make it a Buy It Now sale, but start an auction".
Oh dear indeed. Seller man's feedback is all as a buyer to date, so it might well be a genuine mistake.
From a quick look at eBay's help pages, it looks like his only options are to go ahead with the sale and chalk it up to experience or to try to cancel the sale and eat the negative feedback. The baser part of my nature says "it sucks to be you, send me my thing", but I wonder if there's any other way to resolve this where I get my thing and matey boy doesn't feel like he got a raw deal? (He didn't anyway, IMO).
Don't talk politics and don't throw stones. Your royal highnesses.