The difficulty went from 10m to 15m in three days.  There are four batches of antminer(approx 16000) units to hit the market from Today to Dec 10th.  The calculator I used is accurate. 

But as everyone else said, if it was profitable, you wouldnt be selling.  For having to send bitmain money with no reassurance it would come back three months ago, plus to be losing out on that money gaining value in bitcoin(from 3000 to 6000), you are trying to cut your losses by adding 1000.00 to the price.  You are being a capitalist and we are being realists.