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About the "gaussian equal distribution law" ... it is possible that if surfers can't get the results they want they may just head back to the tubes and search from within them.
For example, if a surfer searches for an adult term and is taken to a mainstream site over and over again, or to only a limited number of adults sites then he likely won't be satisfied with his result, give up (because nobody likes to look around for what they want as it gets frustrating) and just go back to the sites he usually visits which could be interpreted by google as the surfer being satisfied with the domain he clicked on but really he's given up.
IMO, SEO is being big, Time on Site and backlinks.
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