I've been advised to build a blog network to boost up my site. I've actually been building a network already though, just not blogs - they're full sites with minimal ads and aff links, but more than just blank auto-blog looking content. The only problem is they're not on different C-Class IPs. They all have private registration too, and most of the domains were registered on the same day. Should I even bother trying to use these as a network to boost up main sites? Or do I need to start from scratch?