I saw an afk player today in Hongsil's Workshop.   I saw a player ragequitting cuz he did not want to offer the afker free carry.   Meanwhile, like most parties that had afkers, they decided to ignore it and continued to finish dungeons. Cuz they did not want to spend time going through loading screens, or the boss was already half-die and it was a chore to redo it. It certainly made it slower for them, but it was not like quitting half-way rewards them anything.