According to an article in Tech Crunch (2008), Liberty Media has paid $100 million to acquire a controlling stake in BodyBuilding.com. Liberty Media is an investor in Internet holding company IAC, parent company of Match.com, Chemistry.com, Ticketmaster.com, and many other category leading websites.
Bodybuilding.com hosts both a fitness social networking community/forum with 100,000 participants, and it is an e-commerce website with body building supplies, vitamin supplements and fitness clothing. According to the article BodyBuilding.com receives over 2 million unique visitors pr month.
BodyBuilding.com have built very strong businesses around a category killer generic domain names.
PS: A category killer domain name doesn’t necessarily have to be mainstream to become a $100 million business. Sometimes niche category killer domain names can be just as effective, as long as a solid business plan is in place.