"In age based tournaments, the A division is typically filled with the older teams and the B division the younger ones. Many tournaments provide this guidance. In the absence of something better people need use these guidelines and hope that others follow as well, which is not always the case."

I agree with this. In some tournaments A is AA and B is A with correct age kids. Your club needs to manage the correct level and not get caught up in the A or B level. Now AA teams will drop to B to win. That is not good as well but should be a hollow victory for the club. I know, logic and reason has no place on this blog.