Traders will always try and push the price of rare and collectable bikes. My favourite phrases on e-bay “future classic” and “can only go up in value”.
Another thing I think many dealers will do. If they get hold of a rare or iconic bike, they’ll stick it in the showroom to add interest and draw punters in. They may have no intention of selling it, it might be the boss’s pride and joy, but hey why not stick a stupid price tag on it, one, just to make folks go ooooooh and generate conversation, and two, you never know somebody might make a silly offer.