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For me I think it comes down to the quality of the links rather than the quantity.
So if you can get 100 PR5 links vs say 100 PR3 links, your sites PR will grow more quickly.
Plus I think Google is not showing backlinks with a low PR even if it is counting them we cannot see it.
its only showing backlinks with PR4 or more.
Back Link
Inbound links pointing to a page are referred to as back links
WebmasterWorld Glossary [webmasterworld.com]
;)