The main reason to be careful of when interlinking sites is the big G...
First, you've created a clear thumbprint of ownership across all sites and if Google doesn't like something from an AdSense perspective then that could affect all your other sites.
Second, connecting a bunch of sites on the same server/IP could look like a content/link farm; and an attempt to 'game' your rankings (in Google's eyes.)
If you're looking to build a secure financial future, then take it from me and host via multi Class IP, with as few sites as possible on each IP. NEVER interconnect them in any way. Do NOT register them with Google WebMaster tools. Do not use 1 over-riding logo/brand - that serves no real purpose. Use multiple AdSense accounts over time with separate legal identities. Use the WHOIS opt out or anonymous site protection. etc. etc..
Another thing is that before I earn some money doing micro niche sites (5 pages), making blackhat links and autoblogs, but thatīs not what I want now. I want to make larger sites with a constant flow of content updated daily, and unique, not using auto blog content.
As a businessman, I constantly ask myself what on earth could Google possibly have a problem with on some of my sites. But they do occasionally. It's a fact of online business. So we have to deal with it.
Think of it like this: If you were to start a business buying large stores of food, and one could possibly contaminate the other; would you even risk storing them together?
It's just not worth the risk; no matter how wonderful/original/unique you think your sites will be.
I own hundreds and hundreds of sites - so I have an idea what I'm talking about. I'd hate for you to put a bunch of work into a network which could backfire through careless connections. I've lost nearly 200 sites over the last 6 years to Google de-indexing (mostly from pretty aggressive
SEO testing though - and nearly ALL because of over-linking or 'farm' type scenarios in Google's eyes) - and it happens to all of us at some point.
Good luck on your new journey my friend. I honestly wish you all the best. But be careful of being naive where Google is concerned...
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