Eduardo Saverin (Brazillian born) co-founder of facebook, renounced his USA citizenship just prior to facebook's IPO. He is expected to save more than Denise Rich, since the IPO will multiply his net worth.
The last official act of the Roman Empire was to increase income taxes to 67%. At that tax rate the people couldn't take care of the needs of their families, and dispersed to tax-friendlier territories. The empire fell, without a war, without an invasion, and some have said they just taxed themselves out of existence. No government can give anyone $1 unless it has first confiscated that $1 from someone else. Robin Hood may have sounded noble, stealing from the rich and giving to the poor, but robbing Peter to pay Paul, is a policy only supported by Paul.