Here is an example which had to be painful for the seller (I didn't search for it, but there was a build thread on this car here in the past).
https://www.mecum.com/lot-detail.cfm...=CH1014-195872
The selling price was $87k, then subtract the 6% seller fee. I know that car was for sale on eBay a while back with a BIN price around $180k. Ouch...