Not really.
Around 50% of attendees have graduate or doctorate degrees. It selects for people that are smart, curious, wealthy, and not risk-adverse. This is very obvious if you’ve ever been.
Can you back up your claims?
Have you actually been to Burning Man?
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.