3. Dr. Dre
Net Worth: $270 million
Hustles: Aftermath Entertainment and Beats Electronics ownership.
Dre's headphones are everywhere. Alongside cell phones and iPods, his Beats by Dre headphones are among the most ubiquitous products in the street today. Along with Beats co-founder Jimmy Iovine, he sold 51% of the company to HTC for $300 million, giving him $85 million after taxes. He still has a $100 million stake in Beats Electronics, which should only increase under HTC's guidance. It's no wonder he hasn't bothered to release Detox.