It may have been that the "used" firearm was a "consignment" sale, which often end up with high "asking prices". The owner wants what he paid for the firearm, and the gun dealer wants a few bucks for his troubles. The problem is that the firearm hadn't "appreciated" in value, and wasn't willing to sell it for a loss. There are a lot of people who buy new firearms, but after taking possession of them, they change their minds. That new firearm is suddenly a "used" firearm, even if it was never fired.
Sometimes, you can find great deals on "used" firearms that are actually never-fired "new". For instance, during "civil disturbances", a lot of people buy firearms for "just in case", but never get fired. When their "normal" disdain for firearms returns, after the "civil disturbance" has been quelled, they'll seek out buyers...and are usually quite willing to take a LOSS on what the cost to them had been.
One of my buddies was practically "forced" to buy a never-fired "used" Mini-14 rifle, several extra magazines and 2,000 rounds of .223 ammo. The seller wanted to "get rid" of it after the "Rodney King riot" had ended. The price? $200! The buyer (my friend) didn't WANT the rifle, just the ammo! He gave the seller the option of buying back the rifle and extra mags for $200, if he ever felt the "need" to have a firearm. The ammo, however, was NOT a part of the offer/option, though! In essence, my buddy got the ammo for FREE!