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IMO, in this day and age Google is now an active competitor for merchant dollars and has no qualms about driving competitors from the search arena and gifting the traffic to itself and its "authority" partners.
I see e-commerce sites, sites with ads, and sites with affiliate links in Google's organic search results all the time.
Did anyone ever resort to drastic measures like taking a site offline for a period of time to trigger a massive re-crawl? Any idea if something like that may actually work?