1. Readers include non-technical elements in their definition of blogs. Social aspects, including the presence of conversation or personal content is important to them.
2. Regular blog reading often becomes more habitual and less content oriented. Similar to e-mail checking, blog reading can become ingrained into users' online routine.
I can imagine there are huge differences in blog readers. You may read one blogpost, or you may follow a blog systematically. I try to follow less than 50 blogs systematically, but I'm now at 70. There is a difference in commitment I have to the blogs. For some I really try to read the blogposts, even if there is a backlog to read. For others, I simply skim through and pick out any interesting topics. I recall that in the beginning I didn't dare to read some of the blogs because the content seemed so personal and not meant for my eyes, and when I started blogging my experience changed in that regard. At times, people ask me whether they can read my blog. Though I'm now surprised by that question, because I blog in public, so anyone can read it; I can recall the way I felt about reading blogs in the beginning and recognize the idea behind it. By blogging you get beyond a certain level of embarrasment.