I think there's a larger point you're missing because of too narrow a focus, and because of the common misconceptions as to who's rich and who's not.
Increasingly, over the last 30 years, it's been the investor class who's reaped the benefits of our society. Changes to the tax structure, offshoring, financial "innovation", and the purposeful weakening of Labor have shifted income to the tippy-top, and have shifted the source of income from work to investment.
Offshored manufacturing increases profits and reduces jobs. Quashing Labor reduces wages at the same time. To hold consumption high, to support the investor class, various mechanisms have been employed that ultimately amount to socialism for the rich. Capital gains taxes are slashed, to encourage investment, and those who have the money to invest do so, in China and in govt securities necessary to pay for deficits created from slashing upper income taxes. Net investment in this country's productive enterprise actually decreases. In order to do more of the same, EIC is created, which supports consumption and quells labor unrest. More govt debt, which supports the investor class.
The margin is better for them, obviously, in offshored production and low taxes plus investment in govt securities than it was pre-Reagan, otherwise the changes wouldn't have been made, and would not continue.
People who really are rich laugh at middle class notions of who's rich, as well, and exploit it ruthlessly. Most of the people in the top 1% of incomes aren't rich, certainly not by the standards of the top .01%. The income distribution graph of the top 1% is nearly the same in appearance as the graph for all working Americans.
The notion that those at the top are over-taxed is laughable, because most of their income is derived from investment, which is taxed at a much lower rate than earned income. In 2007, the top 400 filers paid 17% on incomes that averaged $163M, iirc, and these guys only pay 15% on enormous incomes derived from risking other people's money, not their own-
http://www.nytimes.com/2010/04/01/business/01hedge.html?th&emc=th
US tax structure is *not* progressive at the top, not at all, and the presence of too much money in the hands of too few people encourages risky behavior, simply because huge losses by them that affect the whole economy affects their personal lifestyles not in the slightest...