The other side of the coin:
I used to buy and sell small airplanes. I looked at a particular one that was a drug confiscation, grossly neglected, was a real pig.
Turned it down flat.
About a month later, called the Sherrif in charge to see if they were willing to lower their price, when he told me that someone had bought it, had a mechanic start an inspection on it, and when the mechanic saw something strange up inside a wing, reached in and pulled out a wad of bills--$18,000 worth.
I could have bought it for $12K