Anyone can write a journal. And that's generally that nature of a blog. It doesn't take a writer to keep a journal. It doesn't take a writer to blog.
But it does take a writer to write.
Professional bloggers are just that: bloggers. It takes so much more than the easy-come-easy-go blog audience to be a writer. Blog readers don't pay for the pleasure. They show up, they read, they leave. All without surrendering their precious cents. From time to time a blog will offer up good writing, but let's not confuse ourselves thinking that "blogger" and "writer" are synonymous. Erroneous, dear friends. Erroneous.
Blogging and writing: two different things requiring different skill sets, sensibilities, and durabilities. Bein' a blogger--even a successful one, with fans and funds--don't make you a writer. And that's just the way it is.