While it was a valiant effort on your part, it can't be a real surprise if they decline to sell BM 1385 parts for at least a couple of months. They need to supply all the S7's they can while the market is hot.
Meh. Ever try to build your own car by buying the parts individually?
Generally, there is far more profit in a part than in a whole that comprises parts.
Certainly I cannot speak for Bitmain, but GM doesn't tell you that you cannot get new fuel injectors for their newest model the day it goes on sale because they need those fuel injectors to build more cars.