Any person may advance to such corporation any sums of money necessary for its business or to enable it to comply with any requirements of law. Such advances and such interest thereon not exceeding six percent per annum, as may be agreed upon, shall not be a liability or a claim against the corporation or any of its assets, except as provided in this section and shall be reimbursed only out of the surplus earnings of such corporation. This section does not affect the power to borrow money which any such corporation possesses under other laws. No commissions or promotion expenses shall be paid by the corporation in connection with the advance of any such money to the corporation. The amount of any such advance that has not been repaid shall be reported in each annual statement of the corporation.