90% of the players that jump ship are tanks imo... sure a few times its dps, but mainly tanks for me. I've seen players jump ship the minute it says there's a player new to the instance, or after one wipe. In fact the other day doing GEX, everything was going well. .. and at the end with garuda at 10% life everyone wiped.... in a blink of an eye half the group left. And that was just on the first pull.... lol