To me, that would be more pragmatic than using wooden onesAluminum bats don\'t break like the wooden ones, nor can they be corkedThey\'re even lighter from what I understandThis would save lots of trees in the long runIt\'s beyond me why they\'re commonplace in college baseball, yet I never hear of them being used in Minor League or Major League baseball.There are a couple of reasons: 1True wood bats cost a lot, but you might have noticed that MLB has a ton of money! They can afford the wooden bats2TraditionMLB started back in the 1800s, which was long before metal bats existedWhile there have been rule changes since then, the game is still basically the sameBaseball fans would never stand for such a significant change in the playing of the gameSince metal bats can hit the ball farther than wooden bats, this would mean that home run records and other accomplishments after the switch would not be comparable to older recordsFans and players would hate that3Metal bats can be dangerousBalls tend to come off of metal bats with more speedIn theory, this could increase the number of pitchers who are hit and injured by line drivesThis isn\'t as big of a consideration in high school and college, because hitters aren\'t as goodBut MLB hitters can crush the ball and do some real damage4Baseball bats are not a major cause of tree-wastageWe kill a lot more trees to make paper and lumber than we do to make baseball batsThe number of trees killed by bats is a drop in the bucketPlus, I believe that most bat companies maintain their own forest land, and they replant the trees that they cut.Other related question