Yes it most definitely beneficial to have an Amazon account. You don't have to sell products yourself. Say you write about perfumes, then you are able to sell perfumes through Amazon. You don't have to have the product to sell it. Amazon will give you the resources to sell whatever you wish (long as it's legal) For example I wrote a story on football player Tim Tebow and activated my Amazon account on that Hub and I have sold his bio about ten times with the Amazon app. Mind you I don't have Tim Tebow books lying around.