N.C. Gen. Stat. § 14-344
Any person, firm, or corporation shall be allowed to add a reasonable service fee to the face value of the tickets sold, and the person, firm, or corporation which sells or resells such tickets shall not be permitted to recoup funds greater than the combined face value of the ticket, tax, and the authorized service fee. This service fee may not exceed three dollars ($3.00) for each ticket except that a promoter or operator of the property where the event is to be held and a ticket sales agency may agree in writing on a reasonable service fee greater than three dollars ($3.00) for the first sale of tickets by the ticket sales agent. This service fee may be a pre-established amount per ticket or a percentage of each ticket. The existence of the service fee shall be made known to the public by printing or writing the amount of the fee on the tickets which are printed for the event. Any person, firm or corporation which sells or offers to sell a ticket for a price greater than the price permitted by this section or as permitted by G.S. 14-344.1 shall be guilty of a Class 2 misdemeanor.
N.C. Gen. Stat. § 14-344