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.