I would have to say that is an extremely absurd answer, because the question poses the typical rescue situation, a small number of victims and lots of rescuers. In that case, I would doff my CERT green hard hat pretty quick. But then the question poses a non-CERT type situation.

I personally have had very consistent results at CPR. Both of my victims were DOA. But one victim received CPR for over an hour (pupils were undilated and his color was good) as our team worked in relays to render aid. Our victim had suffered a witnessed and massive attack and was essentially dead when he hit the ground. CPR definitely does suck up resources.....