Boombox, I agree with everything you wrote except: Art Bell did not invent late-night spooky radio. Long John Nebel (east coast, shows available on Ytube) did, or probably there was someone else before him, maybe. What Bell did invent was "coast to coast" late-night spooky radio. Indeed! And truly a pioneer.
There were times, on the crazier shows, where I thought I could hear Bell laughing. Maybe I was wrong. But I remember this guy who said, "and Art... they have even got recordings of the sounds of Pleadian [space-] ships!", where there was at least a chuckle, or a guffaw, or something.
He also promoted totally bogus stuff, a lot of the time (i.e. guests that he damn well knew were bogus) but that was in the Long John Nebel traditional late night entertainment modus operandi anyway.... i.e., the broadcasters viewed these kinds of shows as what they were: "Entertainment".
Godspeed to Mr. Bell.