The raffles generate a very particular emotion because they play with the expectation and the possibility of "gaining something extra" without an additional cost to normal consumption. When a customer participates, even with a simple ticket for a purchase, he automatically feels that he has an opportunity, and that sense of expectation is what keeps interest until the day of the draw. That positive tension, even if it is minimal, makes the purchase experience not limited only to the product, but becomes a more complete experience.
In addition, the simple fact of imagining winning a prize creates a psychological incentive that increases recurrent visits and purchases. Even if you do not win, the experience is not perceived as a loss, because the customer had already gone for their usual purchase; What remains is the emotion of having been in the competition. If the awards are relevant for example, store products, large discounts or very desired items multiply motivation and mouth to mouth between customers
