But the thing that is almost even more important is, how much time do you profit from mining after you ROI!?
This is the problem you never hear anyone talking about. After you spend all those big bucks on those ASICs and you reach ROI, how much profit do you get after, and for how long!? Not very long, right?
As far as i understand, the "post-profit" you are referring to is almost always directly correlated to ROI. Just did some tissue math but if the logic is that if you get ROI faster, then you also have more capital and opportunity to invest more profitable or more efficient hardware.
Feel free to correct me with real numbers and data.