So A lot of them have this Doubt that how No-Follow Link will help you in Page Ranking, So Here is the Solutions, when Follow link is how much their are more Important and it opposite to that No-Follow Link- Nofollow Link just say Crawler not pass value to no-follow link but their will have the count for the link so this may be also helpful when counts on link with Search Engine.

No follow is a link attribute that instructs spiders not to crawl the particular backlink on the webpage. Hence these links are never indexed in search engines. They are only used to build traffic from various external webpages.

yes ... no-follow is Hidden Treasure

No follow links are also great i f they are of High Pr and related one. They can be great for ranking your site higher.

If you have links from high quality sites then they may help you via traffic.

SEO nofollow links needed for your SEO.
The rate goes links dofollow and nofollow is kept 70/30 so good.