Some people are just so miserable. Not everything in life has to 'make sense' or 'fit your lifestyle'. Sometimes just simply having fun and building crazy shit is what it should be. Imagine being an Engineer and having the privilege to work on this. And then seeing this demo where the public finally gets to see it work. Will I ever own one? Probably not. Do I need one? No. Will Tesla ever make money with it? Unlikely. But sure enough it's a mighty demo of what can be done and it's the best employer advertisement you can imagine. This is how you get the engineers to apply that'll build not only this, but products like the Y that dominate the world market. The one does not preclude the other.