<sarcasm>Because people who earn that much by working are new money, and should be penalized for trying to break into high society. Gotta keep the riff-raff out of the country club, you know.</sarcasm>

On a more serious note, if you make that kind of money for any significant amount of time, you're going to be a member of the investment class pretty soon (i.e. making your money from capital gains) unless you have poor money management skills (or unusual circumstances, like supporting 10 people, or an expensive gambling habit, etc.).