Album sales =/= money...period.
The amount of money artists make on album sales through a major is so ridiculous small, its almost criminal. 50 Cent is a business man who raps.
That was just one example, Dre also has Beats by Dre. I read somewhere HTC is offering Dre 300 million to use his product on their smart phones. Eminem has shade 45 and does way better numbers when it comes to selling his music. 50 Cent struck gold though in that vitamin water deal, somewhere close to 100 million, whats crazy though is his net worth is 110 million. So from all the music he's made, concerts, movies, energy drinks, shoe deals, headphones, and G-Unit records it crazy to think he's only accumalated 10 million from all that. Either he's ran into some bad investments or Dre Eminem and Jimmy Iovine have been pimping 50 hard. Either way fuck it, the guy went from almost being dead to now having accumulated a net worth of 110 million in less then a decade, can't hate on that.