My kneejerk reaction to this is that it's very hard for a programmer-type to write. Part of programming is of course discipline, attention to detail, conciseness, etc. The same things apply to writing but it comes across much much harder because we don't actively write, we code.
So writing is hard and when we write we know we suck. And we don't want to publish things that suck so we don't publish at at all!
Finally, blogging software is a pain in the ass to deal with as a programmer. Over the years I've had 5 properties (2 WP blogs, google group, posterous, custom site, and tumblr) I'd post at most 3 articles to them and then go years without updating it.
I just didn't get the workflow, and maybe that's an excuse but now I think writing is so important that I did what any insane programmer would do when faced with a "my tools aren't good enough" challenge, I made it my damned self:
http://jekyllbootstrap.com which spawned http://ruhoh.com
- Just my personal take on your question.
