There is more to pricing than what a thing is worth -- it's what the thing is worth to other people.
My favorite subject for this is the Pentax K1000, which in my experience generally sells for more than other K-series models (KM, KX, K2) despite having fewer features, less-robust construction (for later models) and being built in
significantly higher quantities. It sells for a lot because many folks my age started out with them, and they want to re-live that experience as they get back into film. (Same for Canon AE-1 and Nikon FM2/3.) And then newbies hear about how great these cameras are, and they fuel the demand, because compared to the cost of digital, a $150 K1000 is inexpensive.
Is the K1000 better than the KX and K2? The answer, demonstrably, is new. But it's considered more desirable, so it commands a higher price. Same for Nikon FE vs Sears KS Auto. The KSA is not as refined but has a better feature set, and I personally think it's a better camera. But everyone has heard of Nikon, and few people know a Sears KSA is a Ricoh XR-2s, and good chance they don't even know what an XR-2s is. (Hint: An outstanding camera that sells for peanuts. I bought both of mine for <US$20.)
I too am amazed at how inexpensive some of those high-end Nikons are. I got a good deal on an N8008 and lenses from a friend, and have thought of supplementing it with an N8008s or an N90. I couldn't afford to breathe on those things in the camera store when they were new; now I can get one for twenty-five bucks or less. Amazing deal on an amazing camera.
And yet... I don't shoot with my N8008 much, because to me it's a bit too automated -- a bit too much like digital. I like the old-camera experience, so to me the Nikon isn't worth much. Yeah, I'd pick up an N8008s body for $20. But I'm also debating the purchase of a Spotmatic, which I figure will cost in the $50 to $75 range. Which is the more feature-filled camera? The Nikon, hands down. It does more, has better optics, shoots faster, and its lenses aren't radioactive. It has more value -- but not to me. And that's why I'll pay 4x as much for a less-capable camera.
Is gear to cheap? To a cheapskate like me, no, not possible.

Personally I am glad there are still undiscovered bargains out there, and I hope that remains the case. It's nice that when people lament the climbing cost of some gear, I can say, "No, wait, there are great cameras that can be had cheap. Nikon N8008, Minolta Maxxum 5, and Sears KS Auto are all examples of top- or-close-to-top-of-the-range cameras of their time, and you can get any one of 'em for twenty bucks or less."
Long may cheap photography ride!
Aaron