For PVP it might be cool if all EPs converged to neutral. For instance, in order to stay Good/Saint you must conduct good deeds. IE, attacking evil players, killing certain evil bosses. Might prevent the dreaded PVP stagnation where Good users stay good to avoid PVP and the evil players are unable to attack because they are max fiend.
I kind of like this idea. Not sure what you could put in for doing good deeds, other than giving out Good points for finishing quests like the Guildmaster's.. but it makes sense.