A blog can bring in decent money if only the blogger becomes a well-known expert who knows the subject better than fairly well, and other people visit his or her blog to get real information. E.g., if your blog is about digital cameras, you have to know EVERYTHING about them, you must be ready to help other people compare them, choose among them, use them, get the latest news about them, etc. And you have to make your blog popular, that is to get as much followers as you can. Sure, some of them will purchase something from time to time, using Google AdSense, etc, but first it will take quite a lot of months (or even years) to become well-known.
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