If you buy a bag of trash…
If you buy a bag of trash for $5000 and realize it's a bag of trash, even if you put it up for sale for $500 you're not going to get anyone interested. If you try to give it away, nobody's going to want it. There is an assumption that just because you payed X for something, you're entitled to a good percentage of that when you sell it. It just happens sometimes that you buy something for far more than it is actually worth, and you have to take the loss.