1. Civs can pilot medic helis, its bugged, who would have thought ... ? (to make sure I just tested it on 7.1.0)
2. Also, a player who plays only medic can never ever afford 30k helis. Even if he is careful with it. For 1 heli you would have to revive 38 people - which aside from 45$ per 5 minutes is the only income medics have. You would never do that many going by heli in the first place. In addition to that, you also have to refuel the heli now and then.
This means that you force medics to make the money first in Kavala or play civ/cop. Thats just contradictory.