Review commissioners so that people can know what they're getting into with a league. It might be positive and negative, but people would understand the potential issues with the league that they are paying for.
e.g. I am currently in a league where the commish blocked me and another player from chatting with the team because we challenged a trade that was vetoed. The commish changed the rules right before the trade and back after. Seeing how yahoo hasn't done anything yet, this may be a way to nip this in the bud.