Yes, ads are often biased towards those who are willing to purchase ad space. Sorry :(.
Are the ads biased?
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If you are looking for reviews on books and such, have you seen this page: http://www.chess.com/equipment/chess+books ?
I've only seen two ads on chess.com for chess books, and both of them were for the Colle Zuke. Those of you who know me will appreciate that I probably wouldn't have started this thread if it was another opening but I'm wondering if the ads are biased.