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"A shill, also called a plant or a stooge, is a person who publicly helps or gives credibility to a person or organization without disclosing that they have a close relationship with the person or organization".~Wikipedia.
So every time two or three people coincide in a thread, they're somehow in the service of the manufacturer in question?
As for "fan boy", why would anyone ever recommend a product if they weren't somehow a fan of it, regardless of whether they actually owned it or not. Ownership of course gives added credibility; see my system for the Cullen cables that are in it.