Why does America love the Cinderella?

Why is America so infatuated with the underdog? For years and years sports fans in this country always want to pull for the team that isn't favored to win, the team that doesn't have a chance. Is it because we really want to believe that anything can happen? Or is it because we are sick of the best team winning each year? This years World Series is a perfect glimpse of this. A team that was called "the underdog" for so long is now the favorite, the Boston Red Sox, is playing a team that has captured a baseball nation and has fans from all over yelling "Rocktober" the Colorado Rockies. The Red Sox used to be the team that no matter what they did, they couldn't beat the Yankees, the were always second fiddle to the Bombers first chair. Now the tide has turned, still clutching to their 2004 World Series win, the Sox are favored and they know what it's like to be the Yankees. No teams won't hate them as much as the Yanks, but if they start winning like the team from the Bronx, pretty soon they may be called "the other Evil Empire." Is it more fun to have your team win all the time or is it better to have competition? Does one team being dominate all the time force other teams to try and catch them, in turn making them better, so isn't the competition a good thing? What should be done to try and make sure underdog's and Cinderella's have a chance each year? Should anything be done or is it fine just the way it is?