Was that a dealer in Houston by any chance? I took an auction for a Dodge diesel 2500, beautiful truck and unbeatable price. But when I got hold of them the following Monday they told me that the truck had been wrecked during a test drive. I asked for pictures, proof, but didn't hear back from them and I know that someone came along with a better offer either in email or in person. Money talked and their honor walked.
These guys were fine with the price mostly but they had expected it would get higher bids. I guess some people would hesitate to buy without warranty or any recourse at all really. On top of that, the seller only allows pickups on Fridays and has in the auction that if the tractor wasn't picked up within 14 days they'd charge $20. a day storage. And no paypal, credit cards, or personal money. It had to be a bank check or money order or wire transfer. In ebay these are fairly draconian stipulations, but they have the right to set whatever terms they want. The buyer needs to read the fine print.