This is nuts. I wouldn't call them brave, I would call them a little insane. If someone told a regular person that the odds were that 5 out of 200 people will die who walk into a certain shopping mall, no one would go there. Ever. If someone said 5 out of every 200 planes would crash, no one would ever fly.
This is no different... The odds you will not leave the event are astronomically high. This isn't about being brave, it is about having a death wish or being addicted to adrenaline.
I also think it is pretty selfish... for those who have families anyway.
Now, having said that, the skill, nerves and composure these guys have is incredible. I just think all of the nuts and bolts in their heads have not been screwed on tightly enough