So what you are saying, at least as I read it is that it really does not matter how deeply your blog penetrates the blogosphere, what matters is that you write something. The reasons I take away from this are;

1. You learn something better technically

2. You improve your communication/writing skills

3. You offer help and encouragement to those who find your blog

4. You show little if any fear in openly discussing technical issues and solutions

5. And you extend your resume to illustrate better who you are, and how you do it

Then I guess we should ask ourselves, where is the negative here?

M.