No one forces you to love your customers, but no one has canceled basic politeness. The majority of sellers are unhappy. The last time I bought baby socks was with a certificate. There are 2 rubles left on the certificate. The seller personally decided his fate - just silently, indifferently withdrawing it, not returning it and not anticipating to take another pair of baby socks. I saw it already at home in the receipt. It wasn't even the amount that angered me, but the fact that the cashier decides for me whether I will use this amount or not. Why should I? The pleasure of interaction is 0.