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How can banks afford to offer credit card rewards?
The banks don't have to pay for credit card rewards. The merchants end up footing the bill. The merchants that accept credit cards pay from 2-4% in fees on the credit card purchase. Those fees go to support the rewards programs. The merchants also take on most of the risk during a credit card transaction (although the credit card companies would have you believe otherwise).  If a thief uses a stolen card to purchase a camera from Mike's Camera Shop for instance, any funds the merchant received will be taken away from the merchant. In addition, the merchant will be hit with a chargeback fee (usually around $20-$60). Finally, since the card was stolen, the merchant will never get their merchandise returned, so Mike's Camera is out the camera as well. No camera, no funds, and a $60 fee to boot. The credit card issuers make $60 on the chargeback fees and have no liability.