If I'm not mistaken and an 66GHs AVALON Unit needs ~450KWh/Month that would be ~$130/Month (how much does the KWh cost in the US?). So the Difficulty needs to be 150x for not to be profitable. O_O

Soooo ~60,000GHs x 150 = 9,000,000GHs
Well umh, yes...
And the $/BTC will probably raise.