This comparison brings to mind a possible... experiment, of sorts. Create two blogs, anonymously, and otherwise unconnected to one's prior writings. Prepare a series of posts, communicating the same concepts, with different degrees of emotion, rhetorical flourish, and eloquence. Promote the two blogs in an identical manner, but never in the same place as each other.

Then, at the end of some length of time, one could compare metrics, such as number of readers and comments left, frequency of agreement/disagreement in comments, or possibly degree of communication accuracy through some means (soliciting guest posts on the blog's theme, degree of comprehension in comments, &c.?)

What might the results of such an experiment be? I suspect the consensus here would be to expect that the "flashier" blog would get more readers, comments, and agreement, but a lower median comprehension level.