In summary, the buying and selling of runs is acceptable, but ArenaNet does not officially support buyers or sellers. Buying or selling of runs is done at your own risk. If we investigate a transfer and establish that funds originated from fraud or RMT, we will take action against all parties involved. That action, depending on the situation, could include removal of funds, account suspension, and/or account termination.Read More:
http://dulfy.net/2018/02/10/gw2-arenanet-buying-selling-raid-runs/