North Carolina General Statutes Chapter 25A. Retail Installment Sales Act § 25A-37. Referral sales

The advertisement for sale or the actual sale of any goods or services (whether or not a consumer credit sale) at a price or with a rebate or payment or other consideration to the purchaser that is contingent upon the procurement of prospective customers provided by the purchaser, or the procurement of sales to persons suggested by the purchaser, is declared to be unlawful.  Any obligation of a buyer arising under such a sale shall be void and a nullity and a buyer shall be entitled to recover from the seller any consideration paid to the seller upon tender to the seller of any tangible consumer goods made the basis of the sale.