Zr40 wrote:
There is no benefit for search engines to penalize for the number of sites hosted on a single IP address.
First of all, you don't know that. And even if you know for one search engine, that doesn't mean the same thing applies to all search engines. Furthermore, I didn't say that they penalized based on the amount of sites on one IP address (that would be silly), I said that cross-linking may be a problem.
Zr40 wrote:
Now you qualify your own statement about search engines caring about it

Not a problem for me to do that for you. I am reasonable after all.
Matt Cutts from Google talks about the problem of cross-linking here:
http://www.youtube.com/watch?v=ufGw65-1je8Surely you can see why it would then be a good idea to have your websites on different IP addresses if you plan to do any artificial linking like that.
On top of that, even though it is anecdotal evidence, I have seen traffic to one of my sites drop (on the order of 25%) on 3 separate occassions after linking to it from another website I host on the same IP address. I did it 3 times over a period of 9 months to test the theory.
Zr40 wrote:
As I posted before, search engines (especially Google) care about the content, not some irrelevant technical details. Make sure the content's okay before worrying about minutiae like the number of sites hosted on a single address.
I thoroughly agree with this.
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