Do you have a percentage of msrp that you look at for a used bogner, friedman, soldano.
Let's assume good condition and recent model...... so not a model that has been replaced by a newer model.
A used SLO in good condition sells for about 2,500. They are 4,150 new. A used Uberschall goes for 1,700. New they are 2,600. Use those percentages (60-65%) as a starting point of what actual selling prices are. On ebay you will find much higher asking prices, but those items do not sell.