For many the value of a “tidy gun” is far much higher in their minds than what they are actually worth in market. Gun dealers have racks full of “tidy“ guns that just sit there for years clogging up space. Eventually the dealer will incur the cost and embuggerance of having to send them to an auction or disposal.
Unless a gun is of a high grade when new, is in very good tidy condition, has not been significantly altered, customised etc and is of a cartridge that is in vogue and for which ammo is readily available the market for used guns really is pretty soft.