Revives are currently going for over 1.3 million a pop.
Defib's not useless anymore. People will get dazed and whether it's their own fault or someone else's the time spent walking back from the null is far too long. Plus it's not really in the spirit of a "team game" if you won't help out a teammate who's dazed.
All a crew needs is 2-3 people with defib and it's far more useful than having most of the team carrying bandage and meat because they don't trust the rest of the crew to keep them alive.