There are a lot more things to consider besides unique IPs. Google is hunting down private blog networks and its methods are getting better and better.
Think of all these things to be different for each blog:
C block IPs
Domain registrars and accounts
Whois info
Google accounts for GWT and GA
And these are not a complete list. So, think twice if you're ready for what it takes. If you want to game the system for getting good SE traffic, be prepared to get all of your sites penalized, once Google finds out a trace that they all belong to you....
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