Seven days after this post was created and the profitability is down from $116/day to $43/day. This proves Bitmain mines the hardware for months before they ship them. You're getting used hardware and by the time you get it (3+ months after you purchase it), difficulty is so high that you're making a tiny fraction of what it would have if they shipped it immediately like any honest company would do.
RE: Antminer D3 ($4000+ per month with just one!)