CA Prob Code Section 10167

(a)

Subject to subdivision (b), whether or not the auctioneer has a contract with the personal representative, the fees, compensation, and expenses of an auctioneer in connection with a sale of property shall be the amount the court, in its discretion, determines to be a reasonable compensation for the services of the auctioneer to the estate.

(b)

If the auctioneer has a contract with the personal representative, the amount of the compensation of the auctioneer in connection with the sale of property shall not exceed the amount provided for in the contract.