I don't think they really ignore it.
Quote from article:
Merchants who handle less cash, meanwhile, bear fewer costs for counting it, calling the armored car, and theft by employees or armed bandits.
Quote from article:
Merchants who handle less cash, meanwhile, bear fewer costs for counting it, calling the armored car, and theft by employees or armed bandits.
Edit: You can't just take the direct cost while ignoring the opportunity costs of the other solutions. As for the cost to consumers of all the card use, the National Retail Federation figures that the so-called interchange fees that their members pay to accept Visa and MasterCard alone cost an average of $427 an American household in 2008. Do you think amazon.com would have lower costs if you had to mail in cash to pay for your order? Also, without the protections a CC provide I would never buy anything from an online store that did not have a seller reputation.