You need to use credit cards for the rewards too. Credit card rewards eat a couple % of the merchants' profits, which they pass along to all customers in the fo

You need to use credit cards for the rewards too. Credit card rewards eat a couple % of the merchants' profits, which they pass along to all customers in the form of higher prices. Therefore people who pay by other methods are effectively subsidizing the frequent flier miles and Red Lobster gift cards of those who use credit.