That's neat, but where is the hedge against bitcoins? This is a long hedge, you'll need short hedges too, no?
However, you are limited by your ability to find a counterparty. Of course, willingness to find a counterparty is a limit in most forms of short or put. Judging by some of the current odds on other bets, finding counterparties to small bets of large swings downward might not be that hard. That particular forum seems to think that bitcoin will go up. Of course getting paid in bitcoin for your bet that bitcoin will drop might be a problem...