Yes, I guess in some cases prices at a consignment lot are higher than FSBO.
But in many many cases, the consignment lot gives sellers a "reality check" on what their coach is worth. The highest prices for a given coach, given condition are FSBO's where either they put little down and have an over-inflated payoff or they think just because it is theirs that it is worth a lot. Find the same thing on boats.
And, as with any consignment lots, you will find some jewels and some rough ones, as condition reflects how they were cared for, NOT how good a dealer's detail lot is. Gee, I wonder if that gives one a better idea of how the coach was cared for-- if rough when put up for sale, wonder how it was treated when the were using it.