That's the thing, the guys chopping up jazz are not the ones making big dollars. The big dollars are made in the club scene, and that's a whole 'nother ball game where it's mostly drum machines and synths.
I am drifting even farther away from the subject now...
But the similarities between (good) hip hop and jazz get often overlooked. I'd say the lyrical side of hip hop is probably the closest musical form to jazz there is. It's about improvisation, and freedom, and trading bars, and musical quotations hidden in the solos/verses etc
Plus, especially as a drummer, I find the musical side of hip hop exremely interesting, as it's basically all about the rhythm and keeping your neck moving. It's all about being "in the pocket", as Modern drummer would put it. Cats like Questlove and Chris Dave, who are hugely influenced by hiphop, are really pushing the envelope and bringing out fresh ideas into the scene.
And sampling in general has had a huge part in shaping the way we hear and play drums. It's so much more than just stealing.