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If our pages are to have roughly 30% of non-original textual content, can we be penalized by Google? Or are we OK as long as this non-original content is relevant to the pages?

I agree that PageRank is a weak factor, but how else would I intelligently determine value of individual links from individual high-ranking pages?

Also, I am not looking to estimate referral traffic - that seems an easier problem to tackle. So, the question remains: How 1 link from high-ranking web site would numerically influence organic search traffic. Page Rank of a site, Page Rank of a Page, Number of other external and internal links from that page, PageRank of our website - seems like all are important factors in a model that I am trying to find.

thank you, but again, I am not looking for a way to improve a keyword ranking. I am looking more for a formula which would approximate how strong links influence organic traffic for sites with different PageRank.

At the very least I am looking for some approximation

1) how many links of high PR would it take to increase PageRank from 6 to 7.

2. how would this increase influence Organic traffic.

thank you, but I am not looking to improve traffic for select keywords - I am looking for an overall organic traffic lift. Most of our traffic comes from long tail.

Is there any way to predict if and how Organic traffic would change if we sucesfully added some high-quality links to our website?

Quantifying link value would help to plan how much time/efforts we should spend on quality link-building. I understand that the more good links we get - the better. But beyond that, I am looking for some methodology/data/formulas that would help to decide if links are worth pursing.

Here is an example:

Let's say we acquired 20 high-quality links from PR 0-5 pages of some trusted web sites of PR6-8. Let's say that on these pages would also link to 10-20 other web sites. Would such campaign be of some direct value to our ecommerce website of PR6?

My question is limited to how high-quality links improve overall Google search traffic to the website only. I am not interested in calculating value of individual keywords - most of our search traffic comes from long tail. I am also not interested in how to estimate referral traffic - both seem much easier topics to tackle. But how would I be able to measure the value of lets say 1 link from PR 8 site with a PR3 page, when there are 10 other external links on that page?