The members of said board shall receive no compensation for their services but they shall be entitled to reimbursement for all reasonable and necessary expenses actually incurred in the performance of their duties as members of said board. They shall not be personally interested, directly or indirectly, in any contract entered into by said board, or hold any remunerative position in connection with the establishment, construction, improvement, extension, development, maintenance or operation of any of the property under their control as members of said board.