Why spend megabucks on a tuner?

I've seen old Marantz and McIntosh tuners sold here on Audiogon for a fortune. My question is: Why?

Most radio stations now have highly compressed dynamics. Most of the few that don't (for my location, anyway) are located on the fringes of reception. And then what happens when you move to a different location, which may have even fewer good listening choices?

At least with a turntable or CD player, I feel that you have a lot more choices. And, it's not location-dependent. With streaming audio becoming a reality for most people, and now HD radio (which I'll admit I haven't heard yet), why is there still such a market for high-end tuners?

Michael