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Actually, I've come to notice that rhetoric and other so-called Dark Arts are still worth their weight in gold on LW, except when the harder subjects (math and logic) are at hand.
But LessWrong commenters definitely have plenty of psychological levers, and the demographic uniformity only makes them more effective. For a simple example, I guesstimate that, in just about any comment, a passing mention of how smart LessWrongers are is worth on average 3 or 4 extra karma points - and this is about as old as tricks can get.
Of course, LessWrongers are smarter than most people, but what's really striking is the willingness to update. And the modesty.