This doesn' make any sense, no offense intended.
To add to what zinfamous said, AMD has to be wary of the side-effects of selling scads of cards to a fickle audience like miners. We all know it's miners driving up demand along with prices. Eventually those miner cards will come back onto the market, usually in force, once something better comes along (or once the mining market dries up). That makes it harder to sell anything new, particularly in the low/mid price range.
Plus possible HBM2 shortages etc.
Yes AMD wants marketshare, but they also want profits to cover the massive development costs of continuing to make GPUs. It is easier to gouge and make huge profits per unit than it is to try and push more units in a PC market that is (overall) shrinking.
AMD's two future customers that they really want to cultivate are deep learning/AI firms and (maybe) miners - if mining holds up. Gamers are becoming an afterthought. Prices/availability of cards reflect that.