I'm clueless about vintage bikes, but a couple of thoughts:
The price might be set high to keep away the lowballers
Interesting that that bike appears to be parked in the world's cleanest garage, painted with white walls and floor - seems like some kind of a clue about the seller
I imagine bike values work like antique car values in the sense that their value peaks when the people that wanted them in their youth reach their peak earning potential
It might be worth that - to the right person. The trick is finding that one person. In this case, even when you find him, the bike might be the wrong size.
I could also see this bike on display at a store somewhere