It's about the money. You find a rapper that is actually there for the music, you'll find great sound.
Example : Brother-In-Law's best buddy drove up to us while we were walking into the mall. Tells us he's got a new CD out, makes us pay for it. It's remixed from the first album he released, and he even has actual songs from other famous artists that you can tell was the actual beat from the song. If you turn it up loud enough, you can hear the other people rapping, because the editing was weak, and he used a FL Studio's loop to cover up most of it...
Example : Al Kapone (Hustle & Flow), made GREAT music, until he got in the spot light because of the movie. It's still great music, but ever since people have been buyin' his music, it's gone downhill. Before he was making a lot of money from it, it was some of the best (imo) beats that have came out of Memphis in a while, from an underground rapper/producer/