The joke is that you consider the price they sold at to be a “fair” value when their values led to them going out of business. Presumably, if you did not have vroom as an option and had to trade in your car, you might claim you received an “unfair” value, even though that value might be helping the businesses stay in business.

> They were the bidder.

Does it matter? Apparent from the fact that they collapsed, they have been getting unfair value.