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How can banks afford to offer credit card rewards?
One reason why some merchants in the US don't accept Discover is that the fee the store is charged is higher than the average. Generally a portion of transaction fee for the network and the issuing bank goes to the rewards program. In some cases a portion of the interest can also be used to fund these programs. Some cards will give you more points when you carry a balance from one month to the next. Therefore encouraging consumers to have interest charges. This portion of the program will be funded from the interest charges. Profits: Rewards: Some rewards are almost always redeemed: cash once the amount of charges gets above a minimum threshold. Some are almost never redeemed: miles with high requirements and tough blackout periods.  Credit cards that don't understand how their customers will use their cards can run into problems. If they offer a great rewards program that encourages use, but pays too high a percentage of points earned can lead to problems. This is especially true when a great percentage of users pay in full each month. This hurt Citibank in the 1990's. They had a card with no annual fee forever, and a very high percentage never had to pay interest. People flocked to the card, and kept it as an emergency card, because they knew it would never have a annual fee.