The commission on auction sales of real estate shall be as follows, viz.: On New York and Brooklyn property, 1/2. of I per cent, and on country property, I per cent, to be paid by the seller, in addition to the expense of maps, advertising and salesroom fees. The purchaser shall also pay the auctioneer's fee of not less than fifteen dollars, except on sales of property producing less than $1,000, when the fee shall not be less than ten dollars on each lot. All legal sales shall be at the legal rates, vis.: fifteen dollars auction fee and two dollars salesroom fees, to be paid by the purchaser.