Most EB-5 Regional center projects follow the Loan Model. The interest on the repayment of the loan from the job creating entity to the new commercial enterprise is usually at a very low interest rate and this probably acceptable, as the main goal of the investor is to obtain the conditional permanent residency status as soon as possible.
Apologies for the “lawyer” answer, but it all depends! Regional Centers and projects will offer a variety of returns and percentages. From a business/investment view, it is best to review an EB-5 investment opportunity with a corporate attorney or financial planner, as coordinated by qualified EB-5 counsel (like our law firm) to review the US immigration consequences of any investment.