I too wondered why the reservation about PayPal, and now I know!
One of my auctions was won recently and the item paid for with PayPal. Turns out, the person was a scam name on eBay, and stole access to someone's PayPal account, and paid with it. Three days later, the payment was revoked.
Lucky for me, I had not yet had a chance to ship the item (and now I ALWAYS wait 3 to 5 days to ship), but several others duped by this person were screwed out of their money. I guess AS just does not want the potential problems of stolen accounts? Or maybe they do not like the fee structure?