No worker would ever get hired if he or she were open with that they would leave the company the very instance a better offer came around. Companies, on the other hand, have no trouble hiring even when they admit that they'd fire you the very instance someone who can do the job for less pay comes around.

Loyalty in the work place is a one-way street. It goes from the worker to the company but not the other way around.

That depends on demand/supply. Tech companies in cities with high demand for engineers have no problem hiring people who will leave as soon as something better shows up.

That is subtly different from what I wrote. :) I wrote that no one who were open about it would be unable to find a job. If you told your interviewer that your only objective is to maximize salary they would (rightly) treat you as a sociopath. A company whose only objective is to minimize salaries (and therefore maximize profits) is also a "sociopath" but that is somehow acceptable.

Yeah, that's true, I guess you'd normally wouldn't say that. Although I've worked a guy once that said something similar and got hired anyway. He still works in the same place after a couple years and still has the same attitude. I think that most people make it up to be a lot less socially acceptable than it actually is.