At auctions, if bidding doesn’t meet the reserve price, the car doesn’t sell. Simple as that. The proportion of cars that meet reserve and sell to cars that don’t meet reserve and do not sell is referred to as the sell-through rate. And there are some cars that just don’t sell as often as others when they cross the block at North American collector car auctions.
This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2016/06/10/graph-of-the-week-10-cars-that-dont-sell-well-at-auction