Except as otherwise herein provided, no member of or person employed by the Board shall have any direct interest in the gains or profits of any investment made by the Board. No Board member or employee of the Board shall, directly or indirectly, for himself or as an agent in any manner use the funds of the Board except to make such current and necessary payments as are authorized by the Board. Nor shall any member or employee of the Board become an endorser or surety or in any manner an obligor for moneys loaned or borrowed from the Board.