I can understand why some would prefer to have a more direct option, but the MacRumors membership system is triggered by PayPal transactions, so there's no option to completely bypass PayPal's services.
However, you don't need to have a PayPal account, or to use the account you have, since PayPal lets you pay with a credit card without logging into an account. This should get most people past most PayPal account problems, especially if you remove all web browser cookies for PayPal so the service doesn't recognize you and ask you to log into your account.