Using Paypal for non ebay items?

  1. What potential problems do you see when I accept payments for non eBay sale? Is there any way that the other person can dispute the payment i.e charge back, claim the item is fake, etc.? From my understanding, PP only protects the buyer when the purchase is made through eBay. Is that so?

    For example, if someone owes me money (not related to eBay sale) and I accept payment via PP, can they say that I owe them an item and claim "whatever" with PP? Any experience with this appreciated.