Eliminating a site from a prospect list just because it nofollows links is focusing far too much on the minimal value one link provides. In any online marketing campaign, nofollows not only have a place but should be sought after as part of the overall strategy. It is not about trying to maintain some healthy ratio of link types in a site's profile; it is about actively pursuing nofollows with the intention of gaining the benefits they bring almost entirely unrelated to organic search.
Read more @ http://moz.com/blog/how-i-learned-to-st ... e-nofollow