If you believe that Nvidia just dropped the price because of random good will to customers, I have a bridge to sell you.
It was 5 months before Vega. That isn't a response.
NVidia dropped the price because it had been on the market since June 2016, likely having saturated the price point and holding abundant inventory. This used to be the normal life cycle of a GPU. MSRP for a few months then falling prices.