I apologize for the late reply. The idea for this response came to me just now as I was absently-minded scrolling through old comments, and I wanted to try expressing it. Don't feel obligated to respond.
I think we agree that individual humans are driven by a diverse set of incentives and motivations, some of which cause the pursuit financial gain, but many of which do not.
It seems that you are saying that a public company is an entity that purely seeks financial gain (at least, as its meta-objective -- e.g. it may take actions that it believes will increase profits in a rather indirect way, with direct monetary loss initially), and that non-monetary incentives are not a meaningful factor. Please correct me if I don't have that right.
Public companies are made up of people, so if your above argument is to hold, it requires that the non-monetary incentives driving those individuals are _utterly and completely_ suppressed, at least for any actions and decisions related to their work.
I can believe that the non-monetary incentives are _heavily_ suppressed by the company, but I don't think this suppression is so utterly effective such that those incentives should be entirely disregarded. I'm not sure how much weight we should place on these other factors, but it certainly seems that it usually won't be 0.