Maybe there’s more to it. Credit card companies charge the store a fee for each transaction. I don’t know if this applies to debit cards. Maybe they are trying to not give their profits to the banking industry. I know a local man that runs a small hunting service. He provides the place to hunt, a house to sleep and food. The credit card companies were charging a large fee. So he figured out a way to get around it. He up charged some items. These people are wealthy people flying in from up north to the south. I doubt they would carry enough cash for their hunting fees.