Some things to keep in mind ...
- The page rank you see is not the pagerank Google uses.
- The pagerank you see is exported 3-4x/year
- It is "guessed" at whenever the page did not have a pagerank back
then. So if you have a "toolbar pagerank" (the one you see) TBPR 3 for
your homepage, and add a new sub-page, it will guess your sub-page to
be (perhaps) PR2, even though it doesn't have a real value for it yet.
- It is page-based ("page" rank :-)), not domain / site based
- Your sites internal interlinking structures determine how pagerank is
distributed among the pages - in the simplistic example where you have
a single page with is fed with pagerank (from the outside), you could
determine how that pagerank is spread among your pages based on the
link-structure in your site. You'll likely just give up if you have
more than 5 pages though :-) - it's not worth it.
- Your example with the homepage with a high PR and the other pages
having lower PR is perfectly normal and could be a "steady state" (eg
the lower pages do not pull down the PR of the homepage over time).
Sure you could concentrate it all on your homepage, but then you'd have
to remove all the sub-pages, with their content, meaning you have even
less chances of getting new links :-)
- and finally: don't worry about pagerank. Work on your content, work
on makeing it indexable and linkable. Work on promoting that content,
work on getting links. Pagerank will come automatically, it's not your
goal though.
John