Why? How does it hurt your clan for others to have a chance to be able to level their gear? I'm not trying to be a jerk, I just don't understand how it's a good thing to NOT help the rest of the community. If this is something only one group can do at a time, I guess that's different (and sounds exploit-y). If loot trapping is something anyone (or any group) can do, and there's no effect to anyone else inside or outside that instance, I don't see the harm.