The point I was making (and, perhaps, JohnnyB too) is that when I ride or drive on a racetrack, the mindset changes. Competitiveness and the red mist take over. Caution and values of self-preservation get thrown away. This is about the adrenalin-rush. It's great!
It's great until it goes wrong. And it goes wrong far more often on the track than it does on the road because cars, bikes, buses(!) etc are being driven far closer to the edge of their (or their driver's) performance envelope.
Don't get me wrong, lots of people do it and enjoy it. I enjoy it too, but with someone else's motor, please!
Greg