They are unhappy with credit card merchant fees: 

NewsCenter 5′s David Brown reported that they are unregulated credit cards fees charged to store owners for every credit and debit card transaction. It’s a hidden fee that is eventually passed on to the consumer.

 For 35 years, Dennis Lane has owned a 7-Eleven on Adams Street in Quincy. Lane said credit card companies are taking a big portion from each credit card purchase and that has spurred him into action.

 Roughly 2 percent of the cost of each purchase is eaten up by the fee.

 An in-store petition is asking for customers’ help. It asks Congress to regulate the interchange fee — a fee that Lane said has skyrocketed in recent years. NewsCenter 5′s David Brown reported that they are unregulated credit cards fees charged to store owners for every credit and debit card transaction. It’s a hidden fee that is eventually passed on to the consumer.

Rather than ask the government for help, why not offer customers a cash discount?