Don't have the time to check the Rules (it's getting late and mah machine is running slow), but the wage is based on the cost of hiring the NPC from the source, correct? And not how much you paid? So if you paid anywhere between 0 (won them or were gifted them) and 2mil (a special custom in an auction) the wage would be the same?
So, umm, why is a Fighter pilot earning more than a Freighter and a Capital Ship pilot? In fact, out of mah small sample of NPCs (MCT, Brawlers, Medic, Builder, Fighter, Barge, Freighter & Capital Ship Pilot) the Fighter has the highest wage