Paypal just updated their policy again and if I am reading this correctly they are now going to be charging sellers with a fee for each refund they process on top of the money refunded to the buyer.
Quoted from paypal's new policy.
Refund Fee. Section 8.5 (Additional Fees) is amended to add a new refund fee. If you refund a Purchase Payment, we will retain the Fixed Fee portion of the Purchase Payment Fee. The buyer's Account will be credited with the full Purchase Payment amount and the Fixed Fee portion of the Purchase Payment Fee will be deducted from your Account in addition to the amount of the refunded payment. The Fixed Fee will depend on the currency of the Purchase Payment and is listed in 8.4(c).
- Amendment to the PayPal User Agreement
Anyway that is how I am reading this.
There are some other changes that may impact your policies on your sites too, you may want to read through the new changes and update your policies as needed.
FYI: I am not an attorney so don't ask me what or if you need to change anything in your sites policies, I dunno.