Does profile backlinks increase page rank

Yes of course. That's why nowadays many people or company offer the service that involve this kind of backlinks.

 

Who cares about PR? I don't, unless i am selling a domain or links. We should always try to have high rankings and not PR.

 

yes, it will help you little more

 

Profile links especially with high PR do follow links provide great link juice and can help boost SERP. Best not to just rely on this; social bookmarking and spun articles can add to your efforts.

 

Backlinks are incoming links to a website or web page. Inbound links were originally important (prior to the emergence of search engines) as a primary means of web navigation; today their significance lies in search engine optimization (SEO). The number of backlinks is one indication of the popularity or importance of that website or page (for example, this is used by Google to determine the PageRank of a webpage). Outside of SEO, the backlinks of a webpage may be of significant personal, cultural or semantic interest: they indicate who is paying attention to that page.

In basic link terminology, a backlink is any link received by a web node (web page, directory, website, or top level domain) from another web node