It's 3.5% vs 2-3% on most cards. https://www.nerdwallet.com/blog/credit-cards/retailers-accept-american-express/ https://www.nerdwallet.com/blog/credit-cards/r

It's 3.5% vs 2-3% on most cards. https://www.nerdwallet.com/blog/credit-cards/retailers-accept-american-express/ https://www.nerdwallet.com/blog/credit-cards/retailers-accep... So they are all taking a good wedge for very little.