What marketing methods have you encountered in your life that make your eyes shine?

My friend runs a cosmetics store. His marketing plan is that as long as someone is willing to recommend another person to his store to buy goods, and the purchase amount reaches more than 1000 yuan, the recommended person will enjoy a face massage in the store for free. If the number of referees reaches more than 10, all purchases in the store will be more than 20%. It is his marketing plan that makes the business in his shop particularly hot, so I admire it.