http://www.businessweek.com/articles/2013-04-18/multiplayer-game-eve-online-cultivates-a-most-devoted-following

A company in Iceland employing 600 people is like a company in the US employing 700,000. This one is the highlight of their economy. It doesn’t make war or hunt whales or pollute the environment. It creates and serves an MMO called Eve about space adventure, conquest, and combat. More people play this game than live in Iceland.