There are rules, they just are a very high level in most cases instead of being massively specific which does allow for ruler lawyers. However you will ALWAYS suffer from "Rules Layers" it matters not if the rules are written down are implied or are simply developed by the collective from previous rulings and punishments. The only way to avoid rules lawyers would probably be to have a completely free form game with no restrictions, which of course invites its own problems.
http://wiki.battlemaster.org/wiki/Rules_and_Policies
