well, yes. That was the entire point of my original comment, that the data is not matching my biases, which surprised me.

I'd also point out that saying 50% of attendees are X doesn't really mean much. Hypothetically, If 0.1% of normal society take absurdly stupid risks, and 0.3% of burning man people take absurdly stupid risks, that would still be selecting for people who take absurd stupid risks.