Expatriating upon IPO may be somewhat uncommon, but renouncing citizenship for various money-saving reasons is more common than we may expect. One prominent example would be George Soros, similarly moving to Singapore a few years ago. (I believe his excuse was that Asia will be the center of the world in the future, and he wanted his children to be educated there, or something along those lines).

As Federal Income Tax, Capital Gains Tax, and Qualified Dividend Taxes increase, we will most likely see more of these flight-from-tax acts, not fewer.