Well, I know that credit card payments, even with Paypal, can be a pain the then neck. Especially if your not verified on Paypal, then your only option is to refund the payment. The price is probably higher because credit card payments sometimes tend to be a bit of a hastle while Paypal is cheaper because accepting payments are easy.
This isn't the case 100% of the time but I would assume the price is higher for a good reason.
