I was a bard once 10-20 went off to solo clear half the map in the time it took for rest of the group to clear the other half. Whenever there's silver I wait for them to get there before opening and I opened all other chests and killed all mobs on my side.
They kicked me in room 18 without saying anything.

Yes I waited at the teleport place like twice instead of going to help because I did 50% of the map and the other 3 were at the other end. By the time I got there they would have finished anyway.

So I just duo now cos pugs are dumb