But realistically it doesn't mean that an average Porsche owner does nothing but speeding on Autobahns. Similarly lots of people in the US drive pickups but only a tiny portion of them actually use them the way they were meant to be used

There are some segments of autobahn in Germany where there is no speed limit. There are many segments where there is a speed limit, varying from 80 mph to 60 mph, especially in or near cities where most people live. There are many segments where there is dense traffic or road construction. You can't just speed through those areas at 160 mph while shouting "out of my way, peasants!"