It plays out this way because anything anyone buys with a credit card, reward card or not, ends up costing 2-3% more than it would otherwise have, because of interchange fees. If you have a rewards card, the CC issuer turns around and gives you, say, half of that back (1% cashback on everything) and keeps the rest. It's kind of like a tax break that you only qualify for if your credit score is above a certain threshold, but you have to pay into regardless of income/credit score.