One of WordPress’s really interesting features is the way it easily tells you what people were looking for when they came to your blog post. In some cases you feel rather sorry for the searcher, who, you suspect, would have been rather disappointed in your tangential views. In some cases (particularly on the technical posts) you think: “Christ, you just want to know that?”. Almost immediately you have a desire to blog the answer.
Which I guess ultimately the point. Since normally the only way to judge reaction is by comments the blog stats are another way of encouraging you to keep on writing and provide a bit of inspiration if you’re flagging.