coz he's rich, successful in the commercial industry and young aspiring rappers will use him as a stepping stone...why do you think people still work with Ja, or Jay-Z or Eminem or P-Diddy...coz commercially they're BIG...realistically you aint gonna go nowhere collabing with Immortal Technique, Sage Francis or anybody big in the underground scene because even though i believe (and so does anyone with a hint of hip hop knowledge) that the underground > commercial hip hop...if you're gonna make it big...you work with the people with the most fame...coz, they can make a wack artist sound good...
and you'll find that other people who listen to 50 in NY are prolly teenie boppers