Selling gear and consumables through PF is merely skipping the MB tax. Selling content is skipping hours and hours of prog and genuine effort from the player.
Also the content being sold through PF is 1) RMT 2) giving the seller access to the buyer's account which are both against the ToS.
And also it's seriously hypocritical of the devs to not allow BLU in Ultimate using the "ultimate raiders' feelings" as an excuse but letting run sellers advertise on PF.