This is entirely subjective. What about those who devote their lives to a cause and go into government? Your money is better than their passion? This line of logic would suggest mercenaries are always have more incentive than soldiers.
I know many people who work in government. They do their job and they take home their pay. Nothing more. If they became personally invested in the outcome of their work, they'd probably eventually quit, because they have little ability to actually make a difference.
Hey, did you know that's 95% of the private sector, too?
Indeed. Part of the difference is that I can start my own company in which I do have control. I cannot start my own government.