In Latin America why is it better to accept payment in cash and not by credit card?

In Latin America why is it better to accept payment in cash and not by credit card?

In Latin America about 7% of people have a credit card, ie, the remaining 93% can makes payments in cash. By 2013 up to 560 million potential buyers are ready to pay cash in electronic stores. Only 40 million buyers can pay with credit card.