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My question is, does that link depreciate at all? The site has a PR of 4 which dilutes the further into the site you go.
1) Google 'reads' the page template and weights the (non-template) content more heavily than template. Or, to put it the other way, devalues the template.
2) If they have created the other site largely to point at their monetised site, this may look unnatural and be frowned upon. On the other hand, it may not. This is discussed in more detail here:
If you have 200 site wide links pointing to your site from another, are these links actually worth anything?
Depends how valuable the pages on which those links are located. It seems logical that some kind of discount is applied for cases when too many backlinks come from same site - it is not known for sure though.
Is it not true that Google will only pass PR from one link as all the links are from the same domain?
That's not how PageRank works: in theory it will pass to all links, but in practice some limits could be used, only Google knows for sure.