Here is an article I found written a few years back.
http://www.hardballtimes.com/m...ll-improve-the-game/
As far as composite bats, I do believe that some coaches accused others of rolling. Here is another article I find interesting.
http://www.acs.psu.edu/drussell/bats/NCAA-stats.html
Anyway, pretty much explains why wood isn't used, and nothing in the article refers to coaches using one type over another due to money in their pocket.