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I also see most of the things that you just mentioned, except one thing, about your point 4. I have 100 links from other webpages, but none of these pages really have a good PR, so it doesn't justify giving me a PR 6. But, I did post a lot at a popular forum, and have my link in the sig there, and I think that their links is the only reason for my PR 6. If google would discount these links, it would mean that I would only have a few links from them, and I still don't think that I would have a PR 6 then.
But, again, that is just my opinion on this issue. It might very well be that google is giving links on the same IP less value, I just didn't experience it this time.
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