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tedster - 6:58 pm on Aug 5, 2012 (gmt 0)
I'm working with one e-commerce site that has a similar Google challenge, and I've come to a similar conclusion that you have with your informational site. It is a bit frustrating to the site owners to even think about trimming their site.
One reason businesses like an online presence is that they are not limited by the dimensions of a physical shop. In a physical store, you cannot offer a nearly unlimited selection, but online you apparently can. Now it seems that you need to be an Amazon to get away with this and still have your strong pages rank in Google.
For e-commerce, I'd say that a product that doesn't sell should get the ax. But for an informational site, it's even more frustrating. I can't say I'm 100% convinced that constant trimming is the way out but I also don't have much experience to draw on right now.