The market is somewhat turbulent, some sellers are trying for astronomical prices and, sadly, on occasion getting them. Just recently I bought a Voigtlander Vitessa camera (a 1950s collector's item) in great shape for £50 on e-bay, 2 weeks later someone paid £200. I sold 2 Sinar rail clamps (as part of a transaction which was profitable overall for me) for £10 each. The buyer resold them for £95 each (normal e-bay price £30 or so). I think the lesson is, if you know what you want and roughly what the normal price is, keep looking and bidding and you will get what you want at the price you want eventually. I think the people who pay big money are mainly newcomers to photography - lack of bricks-and-mortar dealers means prices cannot be checked this way, maybe the buyers haven't worked out how to check past sales on e-bay and establish a sane price level.
Originally Posted by rthomas