There are too many sheep that listen and don't research.
You just have to read the website, it says the i.p. does not matter.
http://www.google.com/support/webmas...37&ctx=sibling
Not too mention I know several top listed webmasters and none try to cheat the search engines. Not one. And since we are top listed we do talk about it.
Anyways people will only do what they want, so feel free to pay a couple extra bucks a month for a i.p. or more for multiple class c's but really you are throwing your money away unless you need a dedicated i.p. for ssl or program testing.