Charterguy:
What you are saying nicely phrased is basically that Germans are thick and unable to do simple maths. I very much doubt that given an alternative that is 70% cheaper, a German will chose LH just for the sake of it.
While for business travellers HHN might be a little out of the way, holiday makers and the casually travelling public will love FR.
Willkommen zu Deutschland Low Fares!!