How to Identify Fake E-books?

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Hi guys, I am in online marketing for the past 2 years. I am getting some reasonable income from that.But I got some money waste before I aware of the fake ebooks in which sites shows a $1000000 valued screen shots can be made by a java script or the help of photo shop software. This will tempt a viewer to compel to purchase that ebook to become as like that site owner within 30 days or a week. I got some experience to identity Fake ebook sites as follows 1.We can ask review in Google or Yahoo etc 2.We can get any discussion forums 3.Site showing only screen shots of too much earnings in weekly basis 4.If there is no proper mail response or contact details What guys do you think? any other method to identify these fake digital products?