One interesting thing is that there are two factors that are not linked; rarity and demand. Demand always trumps rarity. I can think of a few examples, the Kodak Portrait 305 and 405 being one. They didn't make these for that many years, they are coated and have fantastic glass. They are some of the best soft focus lenses ever made, but their price has stayed the same during this last boom when other lenses doubled, then doubled again in price. Like Brian says, there are several excellent, uncommon, and very useful vintage lenses that are still good buys. I buy several types and don't say much about it.
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