exceed fifty Dollars, and not exceed one hundred Dollars, five per Cent on the amount over the first fifty Dollars, and where the Amount of Sales shall be over one hundred Dollars, three per Cent on the amount so over; and when any Auctioneer shall let by Auction or Vendue, any real property, on ground Rent, he shall be entitled to receive for his use a Commission or fee on a Sum equal to ten Years Amount of such rent, and in all cases when any Article or Articles, or property whatever, shall be actually exposed to Sale, which shall not be sold by reason of its not producing the price at which it may be limited, it shall be lawful for the Auctioneer, so exposing the same, to demand and receive, on the sum at which such Article, Articles, or property shall have been struck off, one fourth of the Commission or fee which said auctioneer would have been entitled to receive for his use had it been actually sold; and every auctioneer who shall demand or receive any fees or Commissions not allowed by law, or greater fees or Commissions than are so allowed, shall forfeit four times the amount of fees and Commissions so demanded or received, one half to go to the use of the Person or Persons on whom such demand shall be made, or from whom such fees or commissions shall be received, and the other half to the use of this Corporation, provided that nothing herein contained shall be construed to prevent said Auctioneer from charging and receiving for his use repayment of expenditures or advances made, and a reasonable compensation for storage, and extra trouble, for services rendered.