I had thought of this before, but I just consciously realized why it is hard for me to leave comments on blogs.
I have Google Reader setup under my tech persona. So when I read blogs, I have to switch Google accounts to morph into CC. This is not difficult, but enough of a deterrent that I don't leave comments.
The solution of course, is to move stuff over to the other Google Reader account. Bah.... no time for that.
Until then, my apologies....