Some of my observations.
> People buy scanners, use them til obsolescence, then expect their full investment trying to sell them.
> A lot of used scanners are probllematic, even dead, and think their junk is priceless.
> Many people with more money than brains will pay two times or more than any scanner is really worth. (supply and demand)
> Some people price their junk into orbit, like 'Look what I have'. The best scanner on the planet is the Watkins Johnson WJ-8611.
There are some Avioncs class equivalents in second place. "NEW" in 1980, Government paid $2600 + for each.
In the civilian market, SURPLUS! sold by the pallat full in pounds per dollar. Gutted for parts you get more for the parts.
One on FEBAY advertised for $2360, like the 'look what I have' thing. 5 years later, never sold.
Got the money, there are many GOOD vintage scanners on the market, but you really have to want it bad.
My 2 ¢