Another reason. Many gas stations ask for zip code when you use a credit card. Get the card number, get the zip, get free gas...
My address? Why it’s 1061 W. Addison Chicago, IL 60609. I wonder what the Cubs do with all those Radio Shack circulars.
No, it is because if you don’t give the correct zip code associated with the credit card, then it could prove that the credit card does not belong to you.