Don't get me wrong. I'm not saying you should never bubble your team-mates when healers aren't around. I'm saying that if you have the time to bubble your team-mates as a DPS sorcerer you aren't facing very good players.
Not to mention that it's a HUGE waste of force that takes away from your potential to kill anyone. Considering how lame our burst is to begin with, losing SUSTAINED damage in order to throw a weak bubble on someone is just absurd.