This month BleacherReport.com became only the second blog to ever sell for over $100 million.
Bleacher Report's slogan is "The Open Source Sports Network". The site is a meritocracy. Anyone can publish an article on sport. The more popular the article, the more attention and prominence it gets on the site.
Bleacher Report doesn't just use an open business model, they've also relied on open source since they started. They're a great example of using open source to build your business.