Age: 30
Age: Threadless
Net Worth: $50 Million
What's the Deal?: Since 2000, Jack Nickell has pushed his community-centered online apparel store, Threadless, a site where users can pitch t-shirt designs to be sold. And with Nickell owning all the rights to each design submitted, he collects more than a couple nickels off each shirt. Enough to open a brick & mortar retail store.