I am pretty sure that bitmain can clearly foreseen the profitability of the each algo before one or two month

even they can calculate it.

Unit pricing policy , proves it ,

For this reason they knew that customers would be losing money while buying D3s

I believe  they should not let the profit  fall below $ 400-500$

daily 6$ will destroy most of loyal customers with bitmain's competitors together

Bitmain is a very important company for miners community

I would expected them to follow more ethical and sensitive policy.