I never really thought about selling the intermediates, usually one or two of them pile up and I just leave it. However good idea about selling some of them CAG's. eh.. its extra money eh?
I make it an almost necessity, with every new complex, to have a bit extra intermediates, just for the good money. For awhile I neglected one of my complexes, and left just 2 high yield ore mines not supplying anything until i decided later on. My CAGs sold every bit of ore, never allowing it to fill half way. For just ore, I made allot of money. I just leave food supply's perfect.