There's something to be said for nostalgia/tradition, and Fenway Park has it in spades. I give the owners credit for not switching over to one of those multipurpose stadiums back in the 1960s or to one of their successors, the current wave of "retro" ballparks. For my fellow history buffs, here's an interesting wikipedia article which correctly credits Camden Yards as the death knell of the multipurpose stadium.

Bears, beets, Battlestar Galactica.