Sales != profit.
And again you're whole argument seems to be that they're so profitable they can do whatever they want. Even if that the case in one instance, clearly that's not sustainable on a long term scale
Not one instance, most instance.
Tell me exactly how it is not substainable? I should add that most of these companies are now setting up cloud mining services and selling mining contracts at what are most certainly extremely high profit margins.
What is not substainable is this persistent bear market in the face of continuing innovation and development in Bitcoin's infrastructure.
When the price starts shooting up again, these companies will be even less enticed to sell any Bitcoin.
It seems to me you have little to no argument and keep moving the goal posts. I, on the other hand, have brought forward numerous arguments and factual reports to indicate that miners are not all dumping to fiat the BTC they mine.