I'm sort of on the fence, but leaning more towards the seller paying the %. It's just like using a credit card machine at Wal-Mart, the grocery store, a coffee shop, etc, they all have to pay a fee for every time someone uses a credit/debit card. The bigger stores can handle the fee no problem, just like people selling the expensive snakes, they can handle paying a few dollars to paypal to ensure that they actually get the money.