It seems that prices for used equipment, whether it is photographic equipment, a house, jewelry or whatever is determined by the market.
We have all seen and heard discussions about the 'free market', how it will correct itself. Or not. Ad nauseum. At any rate I have a difficult time sympathizing with those who seem personally effronted to find that things they desire are no longer being given away. The value of all this used stuff is precisely what someone is willing to pay. No more and no less. If you're a seller prices are ridiculously low; if a buyer, the seller is daft, unreasonable and should be restrained for demanding more than you wish to pay for his obviously worthless enlarger or whatever.