Its a common thing when people do roulette and they get the long dungeons. The leavers want to do the dungeon so they get their daily token and get it over with. I have had times when I just want to do it fast and get it over with, but I have never left a group, because of it. Afcourse there is always the expection that someone realy has to go away, because of real life. I remember joining The Aery as a healer and right before the tank started to pull the first mob, my sister send a message via Whatsapp that she needs me to pick her, because of a issue. I quit the group and while someone could see it as rude, I had to decide which one is more important, my sister or the strangers that I am playing with online. I reckon majority of us will pick real life over ingame life.
This is sadly a behavior that will not go away, unless they make it so longer dungeons gives more tokens or trash drop items of value (more token, mounts, special glamour items etc.) otherwise, this will keep continuing.
