Why do people buy high end sports cars just to drive to work and get groceries?

There are lots of various analysis done on things like weight savings, usually works out to something along the lines of saving you 10-30 seconds for every hour you bike. If that is a big advantage to you, then spend the extra grand. Most of us aren't going to realize that small of a benefit. That isnt the only benefit however, they do tend to ride a bit smoother though many actually prefer the ride of a quality steel frame still.