Hello,
As with my experience with search engines,

There is little use to get link from Links page for page rank improvement prospective. Search engines for identification purposes use links from directories and link pages even of high page ranks. Getting link from these directories help search engines to get information about new web sites, to identify their theme categorization purpose only. It is very important to select the most relevant categories, while submitting websites to directories.
For ranking purposes search engine takes lot many things under consideration. The best option is to get links from high page rank pages with very few outbound links. A high page ranked page have some credibility and it gets divided among the outbound links according to the placement of links, and relevancy of the links according to the field or subject of both sites. So its better to get a link from a PR 4site with few links than a PR 7 page with 50-60 outbound links and from website more relevant to your website.
Also try to be away for any techniques that are just meant to fool search engines, wont help now.

Try to get links from variety of websites relevant to your websites. You get most link benefit only when you have link from a page with its own PR, your link look natural and stays there continuously without deletation and look usefull to the visitors of that page. This is reason why google doesnot show all your links, till it confirms that your link is not a purchased ones and is not getting omitted from the page in due time.
It’s always suggested to shift site slowly not in one go. You disturbed your hard worked link structure, which were created naturally and with time.Now Its important to re- write your dynamic urls to Link friendly as well search friendly links which look like more natural to be linked or reached to.



(2) For your second question: Definitely.
This make more sense as these sites will have much more traffic than all the traffic combined from small sites. Would definately help in sales as well for boosting your search engine results and alexa ranking even.


I think if you go through my reply above, you get answers to all your queries as per my knowledge and belief.