Credit cards transaction may only cost a few percent, but the cost to business can be significantly higher. For example visa forces you to no require a minimum for credit cards, and they charge a base fee regardless. Also if a customer issues a dispute, the business may have to pay the dispute fee, regardless of the outcome of the dispute. Louis Rosmann as quite a few good videos on this topic, eg: https://www.youtube.com/watch?v=6an5ZP4Vnzg