That's not true. If i'm not mistaken, paypal charges percentage of the ammount recieved to all merchants recieving money. Also, fees are charged for any international transfer and paypal can disable your account and freeze your funds on a whim.
On the other hand, i don't know what "astronomical currency risk" are you talking about. Merchants accepting bitcoin are not forced to keep their balance in bitcoins. They can exchange it for dollars or other official currency every hour if they wish so. They are not affected by the volatility of the bitcoin exchange rate as you probably asume.
On the other hand, i don't know what "astronomical currency risk" are you talking about. Merchants accepting bitcoin are not forced to keep their balance in bitcoins. They can exchange it for dollars or other official currency every hour if they wish so. They are not affected by the volatility of the bitcoin exchange rate as you probably asume.