Hash rate is now already at more than 32 TH/s - doubled in 1 month. Reward with 1 Antminer D3 down from c. 160 to c. 120 USD per day. Still that's around 12-15 days payback time (depending on the price of energy, shipping costs and taxes).

(I see Antminer D3's at double the buying price - and that's for the (end of) October batch.)

If hash rates double again this month and again in October, rewards might be just about 30 USD per day. If prices do not increase.

Any thoughts?