1. 50 backlinks from PR4 to PR9 (root domain) web 2.0 sites
-Strong natural Web 2.0 backlink are another link search engine values now
2. Manual work done with web browser only
-crucial for long term website SEO developing with clean building record
3. High PR Authority web 2.0 properties boost
4. Exposure to targeted audience
-category & keyword optimized for better traffic chances
5. Quality links that stay long!