Keep in mind, a lot of jobs have transparent (or at least published) salaries which hasn't seemed to render negotiation tactics ineffective or, for that matter,

Keep in mind, a lot of jobs have transparent (or at least published) salaries which hasn't seemed to render negotiation tactics ineffective or, for that matter, raised the maturity level of people holding said jobs. For example, professional athletes and political office holders. I think a more difficult, and more desirable, target for transparency is not one's salary, but one's contribution to the top and/or bottom lines.