Comment by matthewdgreen

The only thing I would add to your comment is that merchants aren’t the ones being forced to pay these stupid fees, it’s their customers (and primarily their poorer and often non-card using ones) who are being quite heavily taxed to fund a marketing scheme for rich customers. Most competitive businesses can’t afford to fund such an elaborate targeted marketing campaign directly out of their fees without some competitive pushback: hence the actual question you should ask is why the entire system exists, and the answer has to do with a pile of inefficiency and rent collection based on regulatory capture.