Healers can actually DPS quite well using Cleric's Stance... not as well as a pure DPS, but they can make a significant contribution. This comes in handy not just for soloing monsters, but also in parties you can change stances and throw out a few DoTs and spells... IF you have a moment to do so. If you ever DPS instead of heal when you're not sure the tank will survive the next 3 seconds, you have shamed the honor of the healer family and must commit sudoku.