So far, and this is based only on those participating in the forums but I expect that it remains pretty true overall... that the overwhelming majority of players are primarily PvE players... I was actually shocked at the small amount who only PvP yet seem to be the loudest here on the forums. Go figure. This is why ESO is focused so much on PvE content, because they can tell from data-mining this exact same thing... ESO is PvE-centric and a very large portion are players who PvE ONLY.