Before anyone has the bright idea of running off and betting on "Yes", check the FAQ about how BitBet keeps your BitCoins if you bet on a closed contract: https://bitbet.us/faq/

(Not pointing this out to be critical. With a bit of thought, the policy makes enough sense to me, for various reasons. Pointing this out to prevent people from doing silly things, and because it's an interesting document on its own.)

One of the "no" bets was for ~7.4 BTC (~$8500 USD). Interesting that somebody was willing to lay down that much.