Salaries are apportioned based on how close a job role is to the company's revenue stream. Executives come out on top because they control the money and payscales. Sales is often second because they can very easily point to new revenues and say "I brought that in". Profit center staff (most Valley engineers) would be somewhere up there because they are at least creating the actual product that the business sells. Support staff - cleaning, office managers, accounting - bring up the rear because they have the hardest time claiming responsibility for a share of the pie.
Within each of those groups you'll see normal salary dynamics based on wider market forces and hierarchy. Engineering manager's gonna make more than most of the line engineers. Comptroller will probably make more than a line engineer too even if she's considered a cost center because she's in a position of relative authority and individual responsibility.
Study questions:
- How close are you to the money?
- How legible are your contributions to the bottom line?
- Could you get significantly more elsewhere for the same role?
- Is management incentivized to retain top-shelf people for your job role?