If you make a living off your sites, you'd have to be an idiot to risk your mortgage by interlinking anything more than A-B-C without having each site on separate c blocks, truly private Whois, unique content, and a diverse backlink profile. And when I say diverse backlink profile, I mean from the types of incoming links AND between your sites. For example, if you have 1200 incoming links from various types of sites (ie. Bookmarks, video sites, pictures, articles, etc) and you repeat 1000 of those links on each site, you might be in trouble. Also need diverse anchor text and targeting pages across your network.
I'm leaving out a few details for this to be a truly all inclusive guide, but this covers 75% of it.
This comes from someone who rapes google in mainstream biz for mid volume financial terms and looks at the SERP's as real estate.
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