I was thinking that it may be for a review product for CB or JV but I don't think you'd be needing more than one product review for a single product. You can just keep one great review for a product and make a sale from it with tons of traffic. So I'm thinking those loads of articles must be for a site with a PPC campaign.
I mean, 20 - 30 articles every week!? Are there even companies that has that number of writers to finish such tasks?
10 good articles would already cost you $100 - $150 at least.
Does sites really consumes 10-20 articles per week just to keep with the traffic for their PPC campaigns or something?