You need multiple IPs if you autoblog
One of the popular trends in internet marketing is setting up networks of sites using autoblog plug-ins. What this means, is that the webmaster doesn't actually write any posts nor do any research. Instead, a plug-in, or series of plug-ins, pull the information from the Internet and automatically post to your blog or website.
Posts are pulled from affiliate sites – which is why these sites are popular and why autobloggers build so many. With sites like Amazon, eBay, Click Bank, and dozens more, once you have signed up and received your affiliate id, you can post products on your site or blog and make commission from each sale.
Some plug-ins also allow you to pull articles from one of the many article directories that are available, and, it's also possible to post videos from YouTube. The only way to stay under the radar with these sites, and you should realize that people build hundreds of them at a time, is to host with a provider that can give you different IP addresses for your sites. That way, if Google finds your network of autoblogs and shuts it down, they can only access the autoblogs on the IP address that they find.
So, if you build autoblogs, pay the extra money and opt for multiple IP addresses with your host. It's better to lose only a few sites rather than all of them.