I should go in database and change is char name to lazyvivi
More seriously:
When theres only one castle, a WoE warper isnt much of a problem, but once many castle will be opened a warper will put the strongest guild/strongest player to an advantage. They could just use the warper and go from castle to castle and ruin part of the fun for the smaller guilds (I've allready seen such a thing happen). Also using a priest with warp usually tend to make forces more organize and in my opinion, should make for better WoE.
Ben