I rationalize this thing in terms of original msrp. Cameras used to be priced based on their build quality and complexity.
This is still the case, for new models in production.
The original MSRP has no relevance in the used market, of course.
Once production of a models ends, the supply is fixed, and from there the number dwindles steadily, due to various factors, one of which being, some owners don't want to sell; those cameras may even be completely unused, as new, but they are simply not in the marketplace.
If the demand is low relative to the supply, as it is with most used cameras, the market price will be below the original MSRP.
If the demand is high relative to the supply, as it is with a small number of cameras, then the market price can be higher than the original MSRP.
Inflation also factors in. Cumulative rate of inflation since the mid 80s is over 130%, an MSRP from 1985 isn't going to have any bearing today.
Pricing in the used market has nothing to do with the original build quality and complexity. Sure, build quality may be a factor in the demand part of the equation.
But the market price is simply supply/demand. Econ 101.
And 'good value' is entirely subjective. A 'good value' to photographer A might be a complete waste for photog B, and they are both correct.
🙂