05-29-14: Tls49That has been precisely my perception as well.
While the demand for FM tuners is not what it was years ago, there is still somewhat of a market for them, especially ones that perform extremely well.
Here are corrected versions of the links DJohnson54 provided, which didn't work because the colon after "http" was omitted:
FM Tuner Info
Kenwood page
And from the Kenwood page:
The KT-917 is considerably scarcer than the 600T and can sell for $500-750 or more ... depending on condition (two with rack handles sold for $980 in 3/07 and $971 in 2/11, and one without handles went for $810 in 4/11).As indicated at that page, and also in a bluebook I have from its era, it originally sold for $1,000 ca. 1979-1983.
Regards,
-- Al