That's one of the reasons most stores have such generous return policies. There's a cost to having an upset customer whether they're right or wrong... at least,

That's one of the reasons most stores have such generous return policies. There's a cost to having an upset customer whether they're right or wrong... at least, when they pay with credit. Sometimes it's cheaper to take a loss on the return than to deal with a chargeback -- which costs time and money even if you successfully dispute the customer's claims.