You hear about "rewriting" articles for marketing purposes. But what about rewriting info-products? I mean all one would have to do is simply start buying cheap WSO's that are getting lots of responses (means they are selling) and rewrite them in their own words and remarket them. No fuss no muss... Just thinking out loud..
Although most of the feature would be same you can add few additional features and add comparison with similar product or may break the rest of the article and add information like brief about the manufacturer, availability, shipping cost etc.