Mercedes makes everything from cheap cars, trucks, off road equipment, and luxury cars.
The E class in most of the rest of the world is a taxi and can be ordered pretty stripped with small motors. Just in the US we get the highly optioned ones.
Proper Mercedes luxury cars really don't start to $90k and up anyway, with the S class, the SL and the G wagon. Its impossible to build a proper high end car for much less than that.
I wish they imported their cheaper cars. I'd love a stripped out C class diesel wagon, with the small motor, manual gear box, no climate control, cloth seats etc. Probably could get it in the high $20ks, a lot of car for the money and very use full.