Why do the professional baseball not use aluminum bats?

New Answer: Really the main reason is money. A metal bat rarely breaks and can last a few seasons. Wood bats break easily and you would have to probably buy at least a dozen to last you a season of maybe 30 games.

The college age kids and younger always use aluminum bats for safety reasons.... see if the wood bat snaps then pieces could fly in a kid's eye or cut them this may give a child a fairly sever injury