Used tools are dirty, oily, and heavy. That's why my shop is outfitted with a lot of estate sale finds. Old people croak, and their next of kin don't want to move a half ton of steel (even to the thrift shop, who also doesn't want to move them around their store), so it ends up in the hands of people like me for near scrap prices.
Walked back to my car shaking my head. Guess they didn't want to actually sell anything.
But others are run by professional estate companies; either they know they can get certain prices online (where?) or they do some form of scam where they overprice everything and when it doesn't sell they offer some "bargain price" to clear the house out.
I get a dud once in a while, but at those prices, I still end up way ahead overall.