"Refusing to play" - alt+f4 fits that perfectly, so don't make surprised face when you get banned. If you want to alt+f4, leave the dungeon group first.
not wasting 5hrs every week, but you are making other people effectively sit in que twice. don't give us that "uu its 3mins to replace me", its 10mins at least if you are tank or healer. so 4 other people waste 5hrs, for you to save 5. Gotta give you credit for having huge balls to even try to justify yourself here, or maybe you are just not capable to see the scope of the situation. Or maybe you are something else.
Usually I don't care much, but I'd report you, just because you are so entitled.

