How would you like to have two employees office here year round so they qualify for the IRS Foreign Earned Income Exclusion of $108,800 in salary?
Meanwhile, an offshore company can legally avoid many other taxes, and an onshore US corporation could even deduct the two employees $201,600 combined salaries as an expense (reducing its domestic tax liability).
Two different companies - one domestic (for those employee salary deductions), one offshore (for trading your million dollar stock portfolio of Wall Street publicly traded stocks and bonds tax free). Both very legal to do under the US Tax Code.
IRS Foreign Earned Income Exclusion