Another aspect is the freedom of choice. If CEO salaries really bothers you, don't contribute to their wealth. Don't consume their products. Contact the shareholders and board of directors and put pressure on them.
But I have to ask this question: why does it bother you? If a person is rewarded extremely well for risk taking and being a good steward of the resources of the corporation, why is that a problem?
A wage earner will earn far less comparatively, but risks far less as well. An entrepreneur risk far more comparatively, and stands to earn far more in return.