1. Your power cost is too high. At 20c/kwh you probably shouldn't be mining at all.
2. You are probably underestimating the flattening out of the difficulty growth. That is just my opinion though.
If you tweak those you can make this slightly profitable. Not an amazing deal but okay. If BTC prices go up before these sell out they will be a better deal.
yeah key is btc fiat/diff jump/power cost . a jump to 500-550 a coin makes the machine less then 2100
then a second jump to 600 makes a profit.
I am heading towards summer if I buy this for 2100 . I have to pull a 2 or 3 blades. To keep it cool enough.
My summer power is 18 cents a k watt.