Hi Vadim,
Here is what I consider to be one of the best posts on PageRank and how it works: http://www.webworkshop.net/pagerank.html
Here is a quote about the potential of increasing PageRank by increasing the number of pages on a site:
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Example 5: new pages
Adding new pages to a site is an important way of increasing a site's total PageRank because each new page will add an average of 1 to the total. Once the new pages have been added, their new PageRank can be channeled to the important pages. We'll use the calculator to demonstrate these.
Let's add 3 new pages to Example 3 [<a>view</a>]. Three new pages but they don't do anything for us yet. The small increase in the Total, and the new pages' 0.15, are unrealistic as we shall see. So let's link them into the site.
Link each of the new pages to the important page, page A [<a>view</a>]. Notice that the Total PageRank has doubled, from 3 (without the new pages) to 6. Notice also that page A's PageRank has almost doubled.
There is one thing wrong with this model. The new pages are orphans. They wouldn't get into Google's index, so they wouldn't add any PageRank to the site and they wouldn't pass any PageRank to page A. They each need to be linked to from at least one other page. If page A is the important page, the best page to put the links on is, surprisingly, page A [<a>view</a>]. You can play around with the links but, from page A's point of view, there isn't a better place for them.
It is not a good idea for one page to link to a large number of pages so, if you are adding many new pages, spread the links around. The chances are that there is more than one important page in a site, so it is usually suitable to spread the links to and from the new pages. You can use the calculator to experiment with mini-models of a site to find the best links that produce the best results for its important pages."
So you see, it could be that those additional pages have potential to really help your site, but perhaps they aren't optimized in terms of the internal linking structure. Before deleting a bunch of content you worked hard to create, I would take a look at how those new pages are being linked to and what pages they are linking to. Study the internal architecture and you will most likely find your answer.
Long answer, I know, but I hope it helps!
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