If we were lucky enough to get one of these before anyone else then it would pay for itself in less than a week. There is already a huge pre-order line to receive one of these. The injection rate of bitcoins doesn't change no matter how much mining power is thrown at it. The more people mining, the less bitcoins each miner gets. I always expect the miners to pay themselves off within 18 months including the electricity used. If they don't, then I feel bitcoins are undervalued and I buy bitcoins if it pays it self off much sooner then I consider selling bitcoins. The reason I choose 18 months is because that is moore's law applied to technology and it seems to be a pretty good metric at least it has worked for me so far. Bitcoin mining technology is going to make a super big leap with these Application specific computers by Butter Fly Labs and that puts a lot of unknowns into the system. That is why I recommend getting only a few or not too many shares and to perceive this as an investment into Bitcoin education.
“I’m fully diversified. I’ve got some under the mattress, some under the floor boards, some in the backyard.”