I live in southern Germany and things are a little more civilised here. As a general rule you will find Radar traps in residential areas and real accident blackspots rather than where they generate most money - although this is changing. Where you get caught for a minor infringement (as yours would have been) you get a minor fine but no points.
Mostly, in Germany, you are not stopped when speeding so you would have to be doing something else for them to stop the car and check.
Holland, where I used to live, are a little more aggressive but the worst are the Austrians who set up traps that seem designed to fleece foreigners.