Expiring cards has a few other benefits as well. It ensures that the card company has a reasonably-recent mailing address for each of their customers. And it ma

Expiring cards has a few other benefits as well. It ensures that the card company has a reasonably-recent mailing address for each of their customers. And it makes it easier to roll out security features/improvements to the actual card since they can limit the maximum age of any valid card. Also, merchants can use the expiry date to alert customers to re-enter credit card details prior to expiry for recurring charges.