If you do not have a credit card then how do you expect to pay for anything you want to buy online?
I think there are some buyers who pay with their paypal account by using the direct withdrawal from their checking account that is registerd with paypal. It is the automatic default when paying with paypal, I always have to remember to click the "other payment options" button to use my credit card when using paypal for payments.
If i had a paypal account that was not under my real info and was going to buy this ebook i would use funds i got in my paypal from ebay sales over spending cash out of my pocket to buy the book cause theres always that chance that payenemy will limt you and then the money would be locked in paypal.