Yeah your right.. but now i realize just now that amazon is afraid that if they accept bitcoin as payment.. because if costumers are not satisfied about bought item or false product you can not get back your bitcoins.. unlike paypal that you can reverse the payment..
That is a good point you have there, but is can be adjusted thus: If you are selling stuff on amazon for bitcoins, then you have to wait for a period of say 2 weeks after sales to give room for refund. If the customer has no complaints, you get your money after the 2 weeks has expired.