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Bottom of the NinthEven if you have followed Paypal's policies with tracking, not shipping to an unconfirmed address, not taking multiple payments from one or more buyers on merchandise, there is risk of charge backs.
If a buyer used their credit card to fund the purchase through Paypal and they decide for whatever reason that they want a refund they can dispute the charge with the bank that issued the credit card. Paypal will take the money out of your account and will wait up to 3 months until the bank has rendered a decision before they release the money. If the bank does issue a permanent credit to the buyer the seller will not get the money back.
After reading the two threads about Paypal I am giving serious consideration to not offering it as an option.