I get emails when a reader (infrequently) comments. The author deleted this comment, so I'll keep it anonymous ...
Say, is it not odd that you don't have a bunch of readers reading your blog? You have been writing this since 2003 and nobody comments or reads it? Is this even real?
Oh and I figured out how I reached your blog. I was looking for "nobody reads your blog" on google and a comment from your blog showed up on the 47th page.
Its sad and funny at the same time...
I wasn't able to replicate his search results, but unless we're post AI this was a bio post, not a bot post.
It's a good question , but there are a lot of blogs that go unread. So mine is not that unusual. What's unusual is that it's been persistently unread for 7 years. So the real question is - "why would anyone write 5,494 posts that nobody reads?" (@9,000 if you add Gordon's Tech) 
The short answer is that I read both of Gordon's Blogs. As I wrote back in 2007 ...
... my own very low readership blogs are written for these audiences in this order:
1. Myself. It’s how I learn and think.
2. The GoogleMind: building inferential links for search and reflection.
3. Tech blog: Future readers who find my posts useful to solve a problem they have that I've solved for myself.
4. Gordon's Notes: My grandchildren, so I can say I didn't remain silent -- and my tiny audience of regular readers, not least my wife (hey, we don't get that much time to talk!) ...
Later, when I integrated Google Custom Search, my history of posts began to inform my Google searches. My blogs extend my memory into the wider net.
So that explains why there are 9,000 "John Gordon" posts.
As to why their aren't many comments/readers, I can imagine several reasons ...
- There's no theme. Gordon's Notes follows my interests, and they wander. At any given time there will posts that most people find boring, repetitive, or weird.
- I'm writing for someone like me, Brad DeLong, Charlie Stross, Emily L and others of that esoteric sort. That's an uber-niche audience.
- I have no public persona (I write using a pseudonym)
- I like writing, but I don't work at writing. I'd have to work a lot harder to write well enough to be truly readable.
- I don't market the blog.
- I update my blog at odd hours, and I'm slow to respond to comments.
- I have an irregular posting schedule.
- I don't right about areas where I'm really a world-class expert because I keep my blogging and my employment separate.
- I often write about the grim side of reality (that is, most of it).
That covers the bases I think. Except ...
Except, it's not quite so simple. It turns out I do have a few readers -- I'm guessing about 100 or so , not counting a larger number who come via Google , but certainly counting Google itself. Some of my readers are bloggers with substantial readership, and sometimes they respond to what I write.
So I do have an audience after all, it's just very quiet.
- Strange loops: Google custom and customized search - and a memory blog
- Google's IQ boost is only beginning
-- fn --
 Why do I share thousands of items via Google Reader? Because that's a searchable repository of things I find interesting. Another memory extender.
 I don't have a stellar Google ranking, but it's not bad
 About 80 via Google Reader alone, where I share these posts. There's also Emily, who comments over breakfast. A lot of my posts come out of our discussions.
 It wasn't clear when I first posted this that I like the question. I think it's a good question and I think it was meant well. Sorry for not making that clear. I've added this footnote.
Update 1/6/11: Based on comment response I probably have more regular readers than I imagined.