The real problem with offshore investments is that our confiscatory rates are so high that forces the wealthy to look elsewhere to invest. How stupid is that?
Oh, I know you socialists want it all........but you will only get it once.
US tax rates are on the low side of the scale, not confiscatory; especially as to the 15% on capital gains. here's a chart comparing rates with other nations:
http://en.wikipedia.org/wiki/List_of_countries_by_tax_ratesAnd, income taxes are only one form of tax levies. Real estate, sales, and, other taxes are higher in many other parts of the world.