I'd say most rappers fall victom to Napster. Since napster, I've bought very few cd's b/c theres usually only 1-4 good tracks on them, plus bullsh*t skits.
Okayartists, Neptunes, J-Dilla, Hi Tek, Mos Def suffer too, most of y'all already had that sh*t b/f it dropped. Basically, anyone who's not getting burn on TRL will significantly lose out on record sales. Most high school, college kids, young adults who got access to the nets, r downloading the tracks they like & f*ck a soundscan.