actually if you got one the first week or two you will ROI (in any way you feel like calculating it)

the trick is to be one of the first on the next gen..   those who got 1st Avalon really made a killing, and whoever comes out with 2nd gen ASIC the quickest will make winners of their first customers too.. 

those thinking HF will make winners of any of their customers now are fools.   If you have to think watts/Gh you already lost.  No one makes up ROI in power costs, that is such a small % of how much you really need to harvest in the first 2-4weeks

Right now in this diff, 1Th will get you ~1.4 BTC a day.  That will be over in a few days and then it will be only ~1 BTC per day for the next 10 days.

power costs are meaningless, at .15 kw/h and 1Gh/W (roughly what Jupiters are nowadays) you pay $4 a day. So in the next diff, during the 10 days of it, you make 10 BTC and pay $40.   $2,000 vs $40.  Does it matter if that $40 goes down to $20?   Seriously??  People think $20 per Th per month savings means anything in this game??

What mattered was hashing when 1 Th produced 2.6 BTC per day back when diff was around ~270mil early Oct