Their fraud costs are not what you make them seem. The credit card companies do not take on the risk for fraud most of the time. They push that risk onto the merchants.
This is why large e-commerce companies have giant fraud departments trying to prevent fraudulent orders and charges on their site; because when they occur, they generally just eat the loss.
This is why large e-commerce companies have giant fraud departments trying to prevent fraudulent orders and charges on their site; because when they occur, they generally just eat the loss.