For me this is a hobby and an indulgence in curiosity. If I do this or that...what will it do to the car? And so on. It's not about making the fastest car on Earth... that's impossible. Because even if I could, it would be for mere moments before it exploded. And if I could buy the fastest car on Earth it would only be for a few weeks or months until the next thing comes out.
No...for me, it is curiosity.