First, I'm fine with single payer, I'd rather have had O'Bummer and the Dim party expend the political capital they had after the '08 elections on that. Instead they did the joke they did, O'Bummercare.Perhaps they don't have much of a profit margin because they blow a large amount of their revenues on excessive executive compensation, inefficiency, and bloated staff. Given that people get healthcare regardless if they pay or not, insurance companies funneling money from one party to the other add NO value to the system. They are merely an inefficiency, a middle man who servers no other purpose but to be a middle man. The entire thing needs to be dismantled and simplified. Yes, I'm talking single payer.
That being said, zero'ing all but inefficiency would not make any appreciable dent in healthcare premiums. It's great to talk about to rile up the lemmings, but it's just not enough to matter. As far as inefficiency, every Corp. has inefficiency. If you think the Gov is going to be more efficient than these Corp's that are actually trying to make a profit, you're past the delusional state.