Miners can mine smth else , and bye more crypt with their sellings .....so nope !
That is true if you are only looking for short term gains. For my part, I only mine the coins I invest in, and I don't give a shit if the mining itself is profitable. The point is to contribute at least in some small way to the stability and viability of the coin because it helps my investment.
So you are right for miners who only mine and don't care what they mine. But that's not the only reason for mining.
Do you read what i am typing? I am telling you a better way to SUPPORT the coin you choose.....not to profit from it ! ! !
Read my post again pls .