I have an opportunity to buy 8 Antminer D3s (19.3Gh) with PSUs for $1500. I also changed my electric supplier to Xoom Energy for a flat $35/month. I still have to pay Ameren for delivery which is $.045/month through September and then $.0225 October through May. Nicehash and AsicMinerValue are both saying the D3s will profit about $1.80/day each. I have 220v and room in my basement to run these and it doesn't super matter if the basement gets too warm. What am I not thinking about? Has the profitability of the D3s bottomed out or can it still drop further? Should I buy these or should I just put the $1500 into something else?