PayPal is owned by eBay, and buyers and sellers protection depends on the payment being made in very limited ways.
Direct bank transfer is a good option - no charges and very safe for the seller. Buyers should only use this method if the seller is trustworthy.
Here are eBay's recommended payment methods:
http://pages.ebay.co.uk/help/buy/payment.html
If you try to use any other method as a seller, your listings will be liable to be moved.
And you will find it hard to get sellers to accept other payment methods.