What's your view on "How Pr Works?"

From what I determine, Pr is given based on quality back-links and page content.

I'm looking to build a higher Pr on one of my domains; the domain has been about for 3 weeks and is currently Pr2. I have done a low blast with ScrapeBox to build backlinks, which is where I think the Pr2 has come from.

Is it just a matter of further back linking or is Pr down to are there many other aspects that are taken into account, to determine Pr?

Thanks.

Google doesn't really care about PR nowadays and they hardly ever publicly update it so just don't worry about it. Google are trying to stop exactly what you are doing now!

Fair point, however a high Pr means more money for adverts on your site.. does it not? If i'm right, then surely it's worth gaining a higher Pr to sell advertising space?

PR is purely a numbers game. I would virtually guarantee that it still works pretty much exactly the same way that it worked when the original Page Rank papers were published:

http://infolab.stanford.edu/~backrub/google.html
http://ilpubs.stanford.edu:8090/422/1/1999-66.pdf

Google stated a while ago that Pagerank is recalculated constantly these days, but public toolbar PR is obviously only exported periodically so your toolbar is well behind what your "real" PR would currently be.

PR has nothing to do with page content unless you determine the number of links on the page as part of the content. It's just a numerical factoring of accumulated link "votes" minus the dampening factor. The only exception is that adult sites are limited to PR 5 and appear to work on a different log scale to the rest of the web.

PR is of course only one factor in ranking and it's mediated by countless other important factors (on and off page), but sheer volume of link "votes" is still and always will be one important determining factor in ranking. However toolbar PR is pretty much irrelevant today and it's death knell was sounded when Google removed the PR display from Webmaster Tools.