Someone suggested to me that the reason for skydiving is the thrill of the risk to life. Um, no, not quite.
It is because, for about a minute, the skydiver is at liberty in the sky without an aeroplane. It is because skydiving is an exercise in personal responsibility, for yourself and for your friends.
Ultimately, it is for the reason Mark so eloquently explains in this video, as he comes out of freefall at a good safe height of 3000 feet:
The risk to life? No, it is the risk of life.