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My concern is about effect on new related content on my real interesting content in site. Let's clear this up: if my site sells services, I'm interested in people that comes to buy those. However is there some related information useful to possible costumers they look for (like informational pages, weather, distances, and so on)
I can spend some time developing informational pages, but people will not buy information from me. They just will use it and that will make my real important content (the services pages) be mixed between informational pages.
In the other hand, informational pages will share page rank (less page rank for my service pages).
So thinking that makes me avoid informational pages, and thus not growing in related useful content.
Any thoughts about it?
As for sharing pagerank, I personally believe that to matter so little that it's inconsequential. One link to an inner page would positively overwhelm any negative PR leaking (and again, I don't see PR leakage like that as a concern).
I don't think I've ever seen anyone dissatisfied with the results of more content. I took a site once from a few pages to many thousands of pages. Traffic multiplied, backlinks multiplied, and sales multiplied - even though the additional content was research related.