I bought (most of) a Durst Laborator 1200 4x5 enlarger with the CLS 450 head yesterday for $50. It's missing the power supply and one or two other items, and some would say that I paid too much for it. As far as I'm concerned I've already gotten my money's worth in entertainment in pulling it apart, cleaning it, learning how it works, what it needs, and in the promise that this is another step towards wet printing my 4x5 negs.
Value is a very individual thing, decided solely by the buyer. As I buyer I don't need others, especially in different markets, trying to tell me what I should pay or what I should sell for. When I want that help I'll seek it. And if the items I offer for sale don't sell, that will tell me something, perhaps several things. I don't think the people who buy from the RFF classifieds are fools.