Hello @yursa, nice video! We recently bought some V9 4th/s from bitmain at the beginning of the year. We payed 20% Importation fee! We are happy with our purchase and gives a very interesting insights on the mining side of the crypto-ecosystem. I agree with you at not looking at the USD price , now the mining profitability is becoming negative and dificulty going up. GPU´s are definitely more flexible to crypto market changes.
Happy mining, greetings from México!
@Layra