I’m sure there are casual Kottke.org readers, but most of the ones I’ve encountered in my thirteen years writing for the site are unusually devoted to it, and to him as a writer and editor — again, even though Jason himself does not do most of the things that inspire that kind of charismatic devotion.
I’ve been following his work even before Kottke.org. Which gives you a clue as to how old we both are.