We all know about ELV right? ELV, European Direct Depit? I never heard of it before I saw it on the clickbank order form. The downside is that it is displayed ABOVE the paypal button, effectively pushing the paypal button button near or under the page's fold. When people want to pay with paypal and cant seem to find the button, you might loose sales. ELV is only used in germany and australia i believe. So what you should at least split test is to disable ELV payment method. This pushes the paypal button to the same hide as the credit card details on the clickbank order form.