Mining cost calculations:

Antminer S7 batch 1 - 1.6481481481 BTC/TH
Antminer S7 batch 3 - 1.4666666667 BTC/TH
Antminer S7 batch 2 (slow) - 1.4658798283 BTC/TH

Break-even cost forecast: maximum of 5.6 BTC for the 4.66 TH S7. Anything higher than that, at this ship date, is unlikely to break-even by the halving. Obsolete within 1 month of the halving at current BTC exchange rate and 10c per kWh.

I don't understand what Bitmain is thinking, but I believe it's something along the lines of "...Born every minute". Because this pricing has gotten absurd.