Back in the days there was the saying that if you had a training/education that is useful in the private sector you 'd be either a moron or an hopeless idealist if you worked for the public sector - no matter if for the city, the Stadtwerke (utility company), firefighters, cops... only the cops and teachers get a "Münchenzuschlag" to compensate for higher cost of living. Then again it isn't nearly enough to fill the difference.