[ThisIsTheWay]

And many merchants either have this priced into their product already, or charge a fee to process a card.

[dhosek]

And if the merchants have it priced into their product, you're a fool to pay cash instead of getting your cut of the rebate.

[leothecool]

Another thing to consider is that no payment method is free for the merchant. Even with cash, you need to pay Loomis, or you need to pay an employee to physically visit a bank.