It's all about usability. In the past, this was expensive equipment, but what can it still be used for today? And who is going to buy it?
I have a rare Nikkor-Q 135mm f/4 bellows lens myself, of which only about 800 have been produced. It's value is rated somewhere between 750 and 1000 USD, but who buys these kind of lenses? Only collectors of old Nikon equipment, and they are even more rare...