Valuing used products is tough. I accept trades for used gear and their is a trick to it. The Agon bluebook is a good place to start but it uses a simple algorithm to determine value. Looking at prior sales in Bluebook is helpful but they average full history. Recent sales are most relevant. You need to audit a variety of sites to see what things are listed for and assume it is worth about 10% less than list price.
Sales from bluebook combined with current list price on hifishark, eBay, Agon, etc... is the best way to value things.
Sales from bluebook combined with current list price on hifishark, eBay, Agon, etc... is the best way to value things.