On the face of it -its mad.
But remember this is one of the rarest Nikon lenses, it has always been expensive. It is the best Nikon lens and is reputedly as sharp wide open as stopped down.
They were about $2000 new but no one bought them, so Nikon ceased manufacture in 2006.
Since they have been deleted, word had got out about Nikons 'best' lens ever!.
Its a crazy price, but It'll be the last one you'll see for a while- hens teeth, supply and demand etc
Mark