Universities are normally non-profit. For public universities, it is understandable that governments invest the taxpayers' money for education purpose.
However, investors of a private university should invest a huge amount of money (campus, buildings, facilities, staff, etc.) without ambitious hope for financial gain. At best (after a few years), a new university can earn enough money (tuition fee and donations) to operate without financial benefits for its original investors.
Who invests in private universities?
It cannot be financial investment, and not all cases are charity. Then, how does this system work? as it is rapidly growing in many countries.
Who makes the huge initial investment?