its worth noting that nofollow links still count toward the anchor text factor, and GWT still shows them as links. based on Google's algorithm change based on redistributing PR based on number of links on a page not so much follow/nofollow, I think we will see less and less of an influence and hopefully eventually they will just put it all to rest.
for me traffic is good but high PR is better.. just dominate the SE's and you will get more traffic.. balance your human traffic and SE traffic..
nofollow is an HTML anchor link article used to instruct major search engines that a hyperlink should not influence the link target’s ranking in the search engine’s index.