While searching for something else, I found an eBay auction for the famous Nikon 58mm f/1.2 Noct-Nikkor. It was bid up over $3400. With 34 bids. Usually when I hear of $$$$ price for a lens, I think of a fast, long supertelephoto. But this is a horse of a different color.
Nikon lenses: the good ones hold their value. The really good ones increase in value.