Said fees shall be used to defray the expense of employing a special inspector or inspectors who shall remain on the premises upon which the auction sale is conducted during all times when the same is open for business. The special inspectors shall be appointed specially for each auction by the licensing authority and so far as possible regularly employed police officers or deputy sheriffs shall be used for this purpose. He shall have power and be under duty to supervise the auction to ensure observance of the laws of this state and to make arrests in the same manner and to the same extent as other peace officers. Any surplus of fees over and above the cost of employing such special inspector or inspectors shall be retained by the municipality or county.