Where's the Jazz at the "Jazz" Festivals

What do Nelly, The Dave Matthews Band (not David Matthews, the jazz arranger), Jack Johnson (the musical artist, not the subject of albums by Miles and Wynton), Crosby Stills and Nash, Steve Earle, Alice Cooper have in common? They're all headlining "jazz" festivals this summer. Oh, and their music has little to do with "jazz". Of course, this is not a new trend, but it's bad enough when "jazz" gets watered down with the Kenny G's of the world, it's now at the point where you literally have to go out of your way at one of these so called "jazz" events to actually hear, yeah, you guessed it "jazz". Now I think it's fine for a festival to throw a curveball here and there. But if you're going to use the word jazz, than jazz should be say, 40 percent, at the least, of the festival.