This hardly matters for a SEO promoting using White Hat techniques. Also getting your post on Wikipedia is more difficult than getting 100 backlinks with PR 2-3.
SEOs would spend the same amount of effort building backlinks through article submissions/Pr submissions and persuading webmasters to post a link on their site than spend the effort in creating wikipedia posts.
You find their reasons here, this would hopefully be easier for people to post genuine articles on en.wikipedia.org
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installing no follow is one good thing wikipedia has done… also think that it is not easy to create articles in wikipedia