I help Guild members out with Dungeons when they are under-geared, I don't mind carrying them because of a few reasons, but mostly because they actually listen to you, and don't get all teenage-anxiety depressive aggressive with me when I tell them to do something, or that they are doing something wrong.
Sitting in a Dungeon which normally takes 15 minutes with people who are actually geared for the Dungeon (even if it is "over-geared") is much more preferable than sitting in that exact same Dungeon for anything up to an hour failing, and failing and failing some more with people that proba