Fair enough, I think the amount of reviews (and buys) influences your position too so just the absence of negative reviews isn't enough. I don't want to sound

Fair enough, I think the amount of reviews (and buys) influences your position too so just the absence of negative reviews isn't enough. I don't want to sound cynical, but why do you think it hasn't already spread so wide that only huge players can game the system enough to gain the top spots? There was an article on HN this month about how book publishers even game the NYT book rankings.