I don't care to know how many high PR backlinks to get high PR for my domain/page, but what are the SERP values for high PR backlinks now that Google doesn't put much weight on them? For instance, does 1 PR7 backlink = 1,000 PR0 links/profiles? If they still carry SERP weight, then it would be important to leverage their value

Pr is used as a parameter to analyze the power of a site or a link,it is not a exact science but it is the only metric that you can use to analyze the juice of a site. I never maded a test to compare how much profile links equal to one pr 3 etc,but is not hard to do. Find a exact keyword that has 2 domain names avaliable like .org/.net,in one site use 1000 profiles in other site use just 1 PR4 link and compare the serps movement. To analyze the serps value,use seo spyglass and see the PR PAGES and the Domain PR. Like you will analyze how much pr3/pr4 links they have,and the most factor used today it is not the PR PAGE it is the DOMAIN PR,like your competitor can have 100 links with PR 0 but the domain pr can be 4/5. What i do is to made a estimative of how much profile/articles/blog comment i will need to compete with them. So this site has 10 pr 4/10 pr 3/5 pr 1 ok but they have 400 Domain pr 3/200 domain pr 2/50 domain pr 1.So i will need at least this number. I to analyze the sources,and will try to use the same.if in a market the rank 1 has 500 profile links,i will do the same...

PR is just a good, simple way to estimate the link popularity you get when you get a backlink on a new site. And who said PR didn't mean anything? It's actually a pretty good indicator of how a site is doing in many of the off-site SEO categories that affect google rankings, such as authority gained through good backlinks.

i haven't found an equation anywhere that numerates the links from one PR level to the next. High PR links are still beneficial and there's no reason why you wouldn't want one...unless it's maybe some site that google considers bad neighborhood.

Google has added truly impressive features and capabilities to its search system in recent years, but all of this is built on the old backbone of the PR system. It is not true that PR is outdated and useless, far from it. There is just a lot more happening on top of the PR system these days, like added authority multipliers and link page location analysis. If you're looking for backlinks, PR is still the number 1 concern - more important than relevance in my view.

PR and ranking for a particular keyword are separate. Rankings are targeted, PR is more a general measure of how well Google likes that particular site/page. Think of your links like advice that is being given to Google. If you were trying to decide something and you got some advice from a good friend that you have known for years and some guy down the street you never met. Which advice would you give more weight? Your good friend of course. Well Google is the same way. Those high PR sites are Google's friends so they give their advice (your back link) more weight than they do the N/A site (the unknown guy down the road). The Higher the PR the more trust and worth the advice they give Google (your link) gets.

What if a high PR backlink puts you IN the sandbox? For example: I have made a handful of PR7, PR6, and PR5 backlinks that none of the competitors on the 1st page have, and went from position 50 to not ranking at all in the top 1000! It could be the Google dance (deindexed for a week now?) but I was just curious as to how many PR0 or N/A links had the same weight as one PR7 link. MS is showing the top 10 results for my keyword having ~300 backlinks, none of which are higher than PR3 -- I thought for sure I would be able to outrank them by now...

Have a Look at the PR table http://www.kenkai.com/google-pagerank-table.htm Not Only Backlinks, Domain age and keyword in URL also considered as major factors in SEO.