From http://www.thetyrianorder.com/home/m...article/638922How will this affect World vs World PVP?
There has been speculation on many forums, that are saying the gem system will allow players to purchase seige weapons in WvW PVP and gain an advantage. This is completely wrong. Players purchase the 'blue prints' for seige weapons for a small gold fee. Players then have to collect something called 'supply' from around the world and use these funds to build the seige weapons. Everyone will earn gold, from playing Guild Wars 2 regardless and this will be more than enough - to pay for the small costs of 'blue prints'. So again, let me state, gems will in no way affect WvW PVP.