I don't find any of the possibilities I suggested in part 1 very compelling, nor do I find any of the commenter's arguments highly persuasive. With the semi-exception that I do agree with the idea that women are more likely to write about their emotions and experiences than men are, and in my experience there are a lot more submissive women than submissive men (at least those admitting to it).
So then, why more blogs by subs than by Dom/mes?
I think it's pretty simple: submission is inherently more interesting to write about.
Why do I say that?
That's Part 3.