Mystery eBay auctions getting ridiculous and ridiculously profitable

There are dutch auctions (explained at the site) and then,

The second type of mystery auction involves offering a silly item, such as Cheez Whiz or a 7-year-old hamburger, as the “item”. Then irresistible gifts are implied for winning the auction.

But the bidders just have to hope that the implied gift is cool and worth, say, $3500.