Interesting Bet. gmaxwell, are you willing to change the bet to be X BTC to be equivalent to the current price of the miner ($5999)? 8 BTC is currently around $6700, so the odds skew as BTC price goes up.
I'm not interested at 8 BTC, but if the $6000 equivalent goes to 5 BTC and the difficulty stays roughly the same, I might be willing to take that bet, for example.