I was just reading about a Scam on Gunstar which I thought may be worth filling you all in about.
Someone has been advertising Airgun/Firearm stuff and will then take Paypal as a "gift" to avoid paying the fees.
Of course the goods never show and as a "gift" there is no buyer protection. I can only imagine taking that one down my local police station.
I know we frequently do this in our classifieds but it might just be worth asking the buyer to pay the fees of 3.4%+20p to have it linked to a purchase.
If you do accept Paypal as a seller then you need to be aware that you are responsible for the delivery. So you must protect yourself by getting a signed for delivery. If you cannot prove postage and delivery then Paypal will charge you back and hand the buyers money back even before they have signed the Post Office declaration that the item was undelivered ( which the Post Office want before they will pay out from their insurance)