Seems like the market for old Stingrays way outshines that for vintage race bikes. You have to be an old bike nut to have an interest in race bikes, but the Stingray is a cultural touchstone for that era. I suppose that's the difference.
As close as I ever came to one was a Western Auto grasshopper green knockoff with a 3-speed top tube stick shifter. I thought I was pretty cool.