Earlier quoted context omitted.
It sounds like you don't know about track days or drag strips. That's the way to enjoy a car that goes faster than 150km/h fully. A 300mph Bugatti is still way above any speed you'd reach, though.
Even in that case a much lighter (and cheaper!) car like an Atom or Caterham will be a lot more fun than one of these hulking great monstrosities. Often faster as well, depending on the track.
Bugattis aren't meant for motorsport enthusiasts anyway. They are too expensive and complicated to be track day cars and an enthusiast would buy something more driver oriented rather than stats oriented.
You could definitely enjoy one on a track if you had one. But you would probably spend more time just enjoying the thought that you own it, keeping it safe, then you would take your actual track car to the track.