I went 100km/h on asphalt road, but I got so scared of the poor mobility and how little brakes affected the speed, I slowed down as safely as I could to 50 or so. Sometimes I remember the fear of driving down from a cliff. If I'd be good with that kind of risk, okay, but I don't see the personal benefit - if I don't include getting to know my limits and the experience of understanding to back off.
In my opinion, it's more of a challenge to make risks like that profitable. If you can translate the stunt for fame, and in the end, money, okay. I'd calculate the risks and benefits. Fear wouldn't be a factor. How can I fear something I've noticed to be profitable?
I'm seeing these stuntmen, daredevils and such as businessmen. If not that, then artists. If not that, then it's for personal kicks.
Personally, I once prayed on a mountaintop I would be able to appreciate my life enough so as to drive it down carefully. My speed dropped from something like 70-80km/h to 40-50, when I considered what was safe speed for me. Most of the excitement was gone, though it was still fun.
In my opinion, I experienced excitement only at the risk of severe personal injury or loss of life. Weighing in the risks, I personally decided to continue the safer way. Extreme risks aren't for me, if I can't translate them to something useful.