I would suggest wording your question a bit more clearly as it can be interpreted a few different ways. However, if the entity in which the investor invests gains value for any reason and the investor benefits from that gain value then this is a viable return on an EB-5 investment. Returns cannot be guaranteed and the investment must be at risk
Although the wording of your question is not totally clear, I believe your inquiry is about the return on investment you can expect from investing in an EB5 Limited Partnership. EB5 investors are not typically entitled to a share in the increased value of the EB5 enterprise. Rather, they are usually promised a locked "preferred annual dividend."
The typical annual dividend provided to EB5 investors at this time is between 1% and 3%, usually closer to 1%. Furthermore, this dividend can accrue and only need be paid out at the end of the investment period, which is typically five years. As US inflation last year was approximately 3%, the return on investment for a typical EB5 investor would not out pace inflation. Of course, everything is negotiable, however the numbers above are prevalent in the EB5 capital market.
It may be helpful to think of the loss of investment earnings on the $500,000 principal investment as the "cost" of the green card provided through the EB5 Program. One should not consider an EB5 investment for purely financial reasons.