I think I was confused by why they are thankful to the lady.You pay the cashier of a store to give you 1 draw at a lottery with prizes ranging from D: most common to A: probably only 1. Its likely a way to get people to go out to stores and buy things since why go all the way to the store if you're not gonna also grab a snack while you're there. Does that help or were you confused by something else?