All acquisition costs in connection with the solicitation of subscribers to such hospital, medical or dental service plan shall at all times be subject to the approval of the Commissioner, and the administrative expenses for any calendar year, excluding the first full year of operation, of any such corporation, including acquisition costs, shall be limited to 25 percent of the aggregate amount of rates, dues, fees and other periodic charges actually received during that year. If the Commissioner finds that acquisition costs of any corporation operating under the provisions of this chapter are excessive, or that the administrative expenses exceed the amount above stated, such finding shall be sufficient ground to justify the Commissioner in revoking the consent of the Commissioner to the establishment, maintenance and operation by such corporation of the hospital, medical or dental service plan.