At $8,0000,000 per line that's 1,000 days of payback at only $1 per brick additional margin, or just over 2-1/2 years.
I promise you, in this market you could have been getting $5 per brick of margin no problem for the last three years. That is a six month payback, or a total of $20 million of additional profit over said three years.
Your 4,000,000 assumption is way off
You made up numbers? Where did the 4,000,000 “fact” come from? Not me...
I guess I will start making up numbers about the Chemical processing industy to validate my Rant... I can’t wait!