I'm not a sports guy, I never have been. However, when I saw the topic of this article, and it's somewhat unlikely placement (Wall Street Journal?!) I just had to read it. It answers a question that has gone through your mind at least once...
http://online.wsj.com/article/SB119143109983647814.html?fatty
http://online.wsj.com/article/SB119143109983647814.html?fatty