I say let the market decide what something is worth and caveat emptor.
For some old school and rare items i would gladly pay more.
Or a better example is something that has a ton of time into both for modification and all the work that goes into, research, sourcing parts, lume, movt service etc.
I bet a lot of stuff never gets posted because people are afraid they will get flamed to death or banned for trying to get what they think something is work.

You can always not buy it...