Well, I'm talking specifically in terms of the concept of rational self-interest here. It's perfectly within reason for the workers to think they should be paid better, given that their labor is now worth more, and their interest of getting paid far outweighs the interest in a more profitable company. In the same way, it's perfectly within reason for the manager to attempt to maximize the company's profit, as it's in their best interest to do so, since a company that makes more profits will (theoretically, of course) pay the manager better. It's an obvious reason why workers have created unions since time immemorial, and the same reason why companies attempt to break unions. It's a complex web of relationships between who owns and manages capital and who works and ultimately generates that capital, and there are many positions one can take, such as the one you hold, or mine.
I'm not saying the employees are slaves at all. The point I'm making is that, if a company finds a way to make more money, then it's only logical that the workers, whose work is the very reason the company is profitable, should at least get part of the profits, whether it's through worker benefits, more pay, or anything else.
Nowhere did I say the company shouldn't make a profit. It's only natural that companies would have significant expenses around material, jobs, offices, and all that stuff, and that's fine. The problem arises when the company has a way to more efficiently make money, and, instead of doing things like reducing worker hours or increasing worker pay, it expects everyone to work the exact same amount and just pockets the money (not to mention when companies do things like firing a lot of their staff during a time of record profits).
You're missing a very important point here, which is that the workers are the ones whose labor is turned into profit. That means that if their work is able to generate more money, they are perfectly within their right to demand more, even if they don't necessarily work any harder.
