Correct. Transparency benefits the company for this exact reason. There is a non-zero cost (headache, dollars, what have you) in leaving an organization. This

Correct. Transparency benefits the company for this exact reason. There is a non-zero cost (headache, dollars, what have you) in leaving an organization. This means that salaries can be at market rate, drift below, and people still may not see enough value to leave. Good negotiating means you will always see market rate or above. Transparency means salaries will drift below market rate until someone deems you worthy of a bump. Buffer salaries are outrageously low: for that reason alone, I would never advise anyone to work there.