I'm assuming that all the stores for which accepting card payment makes a difference already adjusted their prices (in one way or another) to cover it. By using cash you're just paying more to offset the card fees. A lot of small places I know tell you to pay the card fee extra instead - and that's a pretty cool solution.
The card fees are not the main source of income as far as I understand: it's the interest and other fees that really bring in the big money.
The card fees are not the main source of income as far as I understand: it's the interest and other fees that really bring in the big money.