If you run a retail shop or a diner, isn’t it easier to just calculate how much the merchant fee costs as a percentage of your total revenues and then spread out a small price increase among all your products, where the impact would be barely noticed?
How would that kind of collection, calculation,and estimation be easier than a simple provider to cost association?
The suggestion is a subsidy to the more expensive providers at the cost of the cheaper ones. Make of that what you will.
Will a customer care if they’re paying $12.50 or $12.75 for a burger? No. Will they raise an eyebrow because you’re charging an additional fee on top of the entire bill because – gasp – they don’t use cash? Yes, they will.
Making cost and fees obvious doesn't sound to bad. It informs the consumer, with transpanency and opportunity.