My wife and I had a similar "discussion" to this once.
We were in the mall. American Eagle sells T-shirts for $60. And they are nothing fancy, just go buy a set of Hanes or Fruit of the Looms for $7.99 for a 3 pack and you essentially get the same thing. And yet these things were flying off the shelves at $60 a pop.
The conversation was around her saying how American Eagle was crazy and stupid for selling them for that much. I pointed out how many people were buying them. I said we should open a shop and sell shirts like that for those prices, think of how much money we could get from the crazy and stupid people buying them. She said that was a great idea. Then immediately realized what I had done and we had a quiet evening after that. >
It's not the sellers - it's the buyers. If there were no buyers of stuff at stupid prices, there would be no point in trying to sell stuff at stupid prices. But, there are buyers, so there are sellers.
This car may be extreme and will probably never sell for half a mil - but in this world there is a chance it could sell to someone with more money than they know what to do with, which is why it's posted.