The point of being in the competition is that it's supposed to be a level playing field. Once outside the Arena a level 2k becomes a chew toy for a level 13k (supposed is with tongue in cheek) . Reveal should be by choice. I don't care about revealing my id at the end of an Arena (if I finish in a good position), because showing my position to all out weighs the xp I lose from revenge attacks. There are however players who feel different and therefore would prefer not to be identified, and I would want to respect their wishes.