I don't think it's that simple. Imagine your able to mine as inexpensively as anyone in the world through producing your own rigs at cost on other peoples money. Now also imagine you produce enough bitcoin to be able to control the price of BTC by selling it on the market. You not only can mine for less than anyone else but you can also drive the price down to where no one else wants to compete and tweak that price as you see fit to achieve your aim by selling or stockpiling BTC.