Have you ever asked yourself that question? I didn't, but I immediately became interested when a friend of mine told me, my blog could be rated. Nowadays that you hear about major multinationals buying sites for millions or even billions of $ (Google bought youtube for 1.65 billion $), it makes you wonder what fraction of that could you possibly make, if there was a remote possibility someone wanted to acquire your blog.
Here's what mine is worth:
You can check out how much your blog is worth
here.
.