It always seems like some guns are a great "secret value" for a time but the word always seems to get out and the prices catch up with them. Years ago you could find 16 ga. guns for a bargain price. You could find Fox Sterlingworth 16 in high condition for 500-750, 20's for a few hundred more. I bought a 16 and 20 AE grades for less than 4K not very many years ago at the big Louisville winter gun show. Then the market adjusted and 16's and 20's went up in price.
Then it was German Guild guns. In 12 or 16 for 400-800. Some were as well made as guns costing three or four times as much. Or British hammerguns, then box locks all going for a song. Point is that in the end the market finds all the bargains and corrects the prices.
But low to mid range guns are unchanged, with a few exceptions, from what they were worth a year ago, two years ago or even five or more years ago. Maybe an adjustment is coming or maybe not. I remember my grandfather talking about how quickly horses fell out of favor for farm work. You could see matched teams complete with all tack going to the auction block and not even getting a ten dollar bid. Just a few years earlier they were worth hundreds of dollars each. That market decided almost over night that the era of horse for farm work was gone. Perhaps the era for cheap or worn out doubles is also almost done.