Why would someone pay premium price for a Mercedes with 168hp?? Because for their safety sacks. MB is one of the safest car in the world, and not even C-Class nor ML-Class has been compromised.
Imagine a IS300 in the same shape as this S-Class, you think how many ppl are gonna survived the crash if there are 3 ppl in the car???
As a side note, every passanger(3 total) in this S-Class stepped out of the car on their own, no serious injury what so ever. The front doors even open/close as if they are brand new....