Ben Bleikamp, a respected designer and interesting writer has posted his reasonings for ignoring your blogs, and quite simply it is because you aren’t showing your best content.
I browse through 100 blogs a day. I subscribe to 51. That means that when I read your blog I forget about it. It’s your fault. You haven’t proved to me that you’re providing valuable content on a regular basis.Making the front page of Digg is great for your page views but how often does it provide a significant jump in the number of people subscribing to your blog? Making the front page of these social news sites is worthless if you don’t have a way to show new visitors what your best content is.
Check out his full reasonings and even some tips and solutions on his blog.