[morzh]

Antique stores cater to an occasional person who wants to create the atmosphere of days gone by, not necessarily a radio collector. This, creates different market and different pricing.
So when a radio collector ventures into an antique store and sees a radio, he is likely to disagree with the asking price.
An antique treasure hunter, for whom it is likely a one-time buy, to furnish a man's cave, or a theme room, or who is an interior designer who will be handsomely compensated by the customer and for whom the price margin is much wider, will not mind paying that price.

Swap meet is a good place for a radio collector to shop. Not antique store. Not without exception, but still.