They aren't just daredevils, though. Check out "Heuristic Traps in Recreational Avalanche Accidents" http://www.sunrockice.com/docs/Heuristic%20traps%20IM%202004... for one interesting example: a lot of these people would think of themselves as cautious and informed, and still fall prey to heuristic traps (and, many explicitly don't recommend their sport to others, who they believe may not be informed enough to apply the same cautions).