That isn't the profit to the CC company. That is the profit of the transaction processor. They are the ones the merchant hires to send the transaction off to the customers bank. What's in it for the bank that issues the card? Or don't you know how many hands pass a credit card transaction around before it gets on your statement.
Oh and think about this for a second, commercial paper [bonds] is about 8 to 10% So they have to borrow the money to cover your charge. What's their profit again?