I generally don't support endowments. The ROI seems very poor: Only interest on the investment will be used for the cause you are supporting, and it will be for

I generally don't support endowments. The ROI seems very poor: Only interest on the investment will be used for the cause you are supporting, and it will be for undetermined purposes in perpetuity. Also, a permanent source of funding could be a very serious problem, creating a disincentive to change. If you were investing for personal profit rather than to support a cause, would you even consider an investment that offered those terms? Even fixed rate investments return your principal eventually.