By resetting score you only allow farming without the cost of leaving which they all do already for the most part. It would be better to allow players 7 days to choose a server than no changing no guessing no travel to. If you leave your out no pvp for a month. Sound silly doesn't it. So does resetting score.
They could also remove the fact Emperor is based of a score bored which can be abused and doesn't represent leadership but who has the most free time or ability to farm AP.
PVP without motivation will die even faster than with motivation like thatLeaderboards of any kind are never good for PvP games.