In this forum post from 2015 Gaile Gray say that selling posts in the lfg is allowed http://prntscr.com/lscmc2
"Our policy: Players may use the LFG Tool only for the formation of a group.
Players may use the tool to sell a spot in a group, but they may not use it to sell or trade items or for any other unintended purposes. Doing so will result in an account infraction.
You can help us reduce the spam and refocus the tool by reporting individuals who are misusing the LFG Tool. Simply click on the name of that player in your chat window, right click, choose “Report,” and then choose “LFG System Abuse.” With your help we’ll be able to keep the LFG Tool clear for your use in forming groups"
However in recent responses by Anet GM's they have said this game is meant to be actively played, how is getting boosted in content u otherwise wouldnt succeed in count as actively playing. The people selling raids usually tell their customers to kill their char and they will do the raid themselves so the raid can be done smoothly. This is not active play and you are boosting your account with rewards you otherwise would not get.
A big portion of the raid lfg and other sections of the lfg is filled with people selling clears, how is this allowed. RMT is a big no no for Anet and i'm sure some of the sellers accept real money for clears aswell.
What do you think