How Demand Media (Content farm) & its Profitable Business model works
Demand media, a content mill site which is behind popular sites like eHow and Answerbag, producing about 20k articles/day from 13k freelancers all over the world. Though demand media business model is against Google recent panda algorithm, still they are the leader of the industry producing content solely based on how much it will earn from advertising for LTV (life time value).
Here is an infographics which clearly explains you how demand media produce earning potential content which makes them a billion dollar company ($1.57 billion) in Internet industry.
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via (Online MBA)