If they are not 3" and not steel shot compatible, price should be way down unless some special model, like a Trap gun.
Or unless your use means you don't have to use steel and don't give a rat's ass about 3" because you have no need of it. Which would, for example, cover just about all the upland game bird hunters and trap and skeet shooters out there. There's a few of us...
Two shotguns that I bought early and have trimmed back all my shotguns to are a Browning B-2000 and a Superposed, both with fixed chokes. I think modern Browning shotguns (along with other makes) are getting fuglier each year. I can get all the synthetic and tacti-cool firearms I want at work. So were I to be in the market for a new shotgun (and Brownings seem to fit me), I would probably be looking for something back when steel was blued and not camo, and stocks were walnut and not plastic. It sure would be nice if people thought they had to give away the shotguns back from those days because they believed the prices should be way down, but it doesn't seem to work that way.
Having said that, choke tubes are hard to argue against. I've had them on shotguns since departed, liked them, and had no problems with them from either a patterning and use standpoint. If I really felt the need, I'd drop a bit of money and get tubes installed.
It is a self correcting issue. If you ask to much for a shotgun in comparison to the demand for that shotgun, it won't sell. And that doesn't change whether it's a Diana grade Superposed, an old Winchester Model 12, or the latest, greatest from Benelli.
If shotguns are regularly selling for those prices, it is because there is a demand for them which that price meets.