Whenever bonds are issued by the Board or its successor as provided in this Act, it shall be the duty of the Board or its successor to establish charges or fees, including without limitation fees for student activities and fees for student facilities, for the use of any such building or buildings or structures sufficient at all times to pay maintenance and operation costs and principal of and interest on such bonds; and all revenues derived from the operation thereof shall be set aside in a separate fund and accounts as hereinafter provided and shall be irrevocably pledged for and used only in paying the cost of maintenance and operation of such building or buildings or structures and paying the principal of and interest upon the bonds issued for the purpose or purposes set forth and described in the resolution authorizing the issuance of such bonds, and such charges and fees shall be sufficient at all times for such purposes.