I think its because of the Market sizes. In the Easts, you have Phily, New York, and Boston, in the Wests, you have The California teams and Seattle. In the Centrals, all there really is is Chicago, and to a smaller extent, Detroit. St. Louis, Milwaukee, and Kanses City are all very small markets, comparitvely speaking, so those divisions couldnt possibly be as good as the others.