First, read this:
http://online.wsj.com/article/SB10001424052748704604704576220491592684626.html?mod=djemITP_h
As it is, state governments are too dependent on the rich for tax revenues. A study showed that people entering New York state, for example, have lower incomes than those leaving the state. I now understand why some Democrats are leary of taxing people who can move, hire lobbyists, or employ smart lawyers.
I wholeheartedly feel that there is too much centralization of wealth especially in the US - but this problem will be tricky to solve.
metat