for most people more MP are just as usable or important as an car that drives more then 220 km/h.
even those lucky enough to live in germany can hardly drive more then 220 km/h regulary.
either there is speedlimit or too many other cars on the street.
maybe there are some who drive sunday mornings on a empty autobahn or on a racetrack.
but for the majority it´s useless.
but nevertheless 80% want a fast car.. even when they will never make full use of it´s potential. and of course everyone has excuses why they want/need a car that drives 300 km/h even if they can only drive on US highways.
i think many of the crop freaks and billboard printer are a bit like porsche buyer.....

they drive a racecar but that does not make them a real race driver.
they are tech nerds who enjoy technology for it´s own sake and they make up excuses (i have to drive a lot, i need to go fast to my meetings, im always on a tight deadline).
but they don´t do anything more usefull with a porsche then people with a VW golf.
and they are not even much faster .. because the traffic is more important then the topspeed.