I was also curious about the average profit margin of convenience stores and gas stations. Most of the souces said it was around 10%. What they didn't say, was whether or not the cost of credit card fees was already calculated in the reported profit margins. I'm betting they are, as profit margin usually means net gain after expenses. Credit card fees are just another known and expected business expense.
If MrsM had purchased 4 dollars worth of nourishment for her son, the business would have paid the credit card company 27 cents for the transaction. It might have cut into their profit, but MrsM would be a happy customer rather than one that will probably never patronize that shitty store in the future.
Customers are fed up with bullshit fees and exceptions to good customer service. Look at the bank fees that RC mentioned. Or look at the fees charged by cell phone companies. Most of these added charges are pure profit, and do not reflect a realistic business cost. These fees are motivated by pure greed, and a complete disregard for the customer.
Of course we have libertarians defending them, even when it is evident that the greedy fuck business owners are violating a CONTRACT, the holy grail of libertarianism.





No prob. I'll think of you every time I report a business. 