Submitted: Jul 6, 2008 - Charlotte, N.C. -- A Charlotte businessman paid $21,000 for a short letter written by a 17-year-old Hank Aaron, in which the future home run king tells the owner of a Negro League baseball team that his parents approve of him joining the team. The Charlotte Observer reported Sunday that Jeffrey Gitomer outbid several others, including the Negro Leagues Baseball Museum, for the letter at a sports…