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when people spread out sites on different c-classes they usually intend to link them together. But being paranoid and knowing google has access to your whois it could probably eventually notice that they are all owned by the same person even though they are spread out. that may sound a little extreme, but personally i would rather take the time and slowly build up links to high quality sites over time rather then trying to do these blackhat seo techniques.
you could buy a few resellers and spread your sites out for the purpose of not having all your eggs in one basket. so if one hosting company has a lot of downtime you still have your other sites pulling in traffic.
you can have as many sites as you want on the same IP, it doesn't really matter. if your on shared hosting then you take the chance of being on the same server as a spammer which could make your IP look bad. 99% of the time its ok, but you still run that 1% risk. If your on a dedicated and it's only your sites on there it's all good.
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