Doesn't one of the arguments that sometimes works, or at least carries some weight, go along the "efficiency of medevacs because of quick access to city via city heliports" line? I thought that was the reason that the Perth heliport was allowed to stay operational, after being threatened with closure. It is mainly used for tourist flights, but is still very handy for urgent transfers to the city hospitals. I'm sure someone else on rotorheads knows the exact details etc.