I was running Dzemal Darkhold one time and the healer we had was Needing/Greeding on the winning loot. After getting the loot in after the second boss our healer leaves the run without a word. I was rather surprised, so we ended up waiting for another healer to get in. I learned now that this has been happening to my other Free Company members. People will loot on the rare items "then leave" in the middle of the run and sell them on the Margret Board.
Dose this happen a lot?