Blogging is not one of those things we don't have to do every day. Sometimes it's something that we do 3 or 4 times a day. It's the same with commenting. And, as we engage in this type of "intellectual" work, it's also important to remember that even if something is not commented upon, that doesn't mean it hasn't been read.
In some spheres, that called lurking: you hop on a blog to see what's written and commented. I encourage it; I do it. It's part of the process.
But don't stress if you don't see a comment on your blog or a response to a comment. That is, of course, unless it's December and your blog is just you and no one else.