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It's more of cheap insurance than anything else. If Google ever decides to give separate IPs more weight, you're covered. If not, it doesn't hurt any and might allow you to slip under the radar for some minor interlinking you may do.
So basically. No downside, possible upside. That's why people do it. I've seen some articles posted with anecdotal stories about some sites doing better than others on a separate IP, but you can never compare sites like that with 100% accuracy. There are just too many variables.
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