Remember, just because a website is accepting paypal, doesn't mean you're protected. If they accept credit card payments through a merchant account, then that's a different story. At least that way, you have protection from your credit card issuer in case you don't receive the goods.
Also, always remember that paypal is a third party payment processing company not an actual bank so that means, they have their own regulations that doesn't have to comply with the banks regulations which is not protected by federal banking laws.