The bulk of the costs aren't so much for the 5 board members, so much as for the investigators who must be paid to investigate complaints against midwives.  Weeding out the incompetent, the quacks, the impaired and those who succumb to illegal activities on the job is the core role of the board, and is no job for a "part time junior clerk".  The board also passes regulations on qualifications, continuing education and standards, which is again not a job for a clerk.