I'm very glad I took Mordecai's advice and set up Google Analytics to track usage of this blog. It's fascinating to look at the "Geo Map Overlay" and see where people are reading, or more accurately, where the servers are that grab it for someone, presumably nearby, to read. (It's also embarrassing to see what a fraction of the count is from the server I use. Am I that narcissistic? I hope it's more that updating the blog necessarily forces me to look at it rather a lot.)
It's also a little scary to see how easily my thoughts turn to how to increase readership and coverage. "Gee, we had readers in Japan before, but none now. How can I change that?" or "I'm missing Africa and Antarctica..." (as if people there have nothing better to do than to read my blathering!). I wish I'd started earlier, so I would have more data to look for trends in... there, I'm doing it again!
I don't have a "market" as such. I am doing this for fun. Funny how quickly a little data makes me start to think like a TV network executive chasing ratings!