There are many people on the forums and even gurus selling courses teaching you how to use article submissions to boost traffic and get higher rankings. Although I can't say I've personally looked at the courses, many of the forum posts seem to lead you to believe that just by writing an article a day and submitting it to the search engines you'll magically get lots of traffic.
Having done article submissions myself, I have to say I'm somewhat skeptical about the value.
Article Submissions for Traffic
Even if the directory did get some traffic, click throughs on the author bio link tend to be around 5% (if you are lucky), so even a thousand people seeing your article is going to send you just 50 visitors. It doesn't seem worth it to me! There are only 4 or 5 large directories that get any significant traffic so even if you do get your article published on hundreds of sites, they don't get any traffic.
Furthermore, if you submit the same article to hundreds of directories, Google has a duplicate content filter which discounts pages with the same content. Hours of work might be thus wasted as Google ignores the vast majority of sites with your links on them. To make it work, you have to submit unique articles to each directory, which can be a time consuming or expensive process.
There is a suggestion that article marketing will somehow gain you hundreds of links without lifting a finger because there are desperate website owners eager to put your article on their site. Now in my experience, and talking to other SEO analysts, although your article does end up on other people’s websites, they tend to remove your bio link or put a no follow attribute in the link, rendering it useless from an SEO point of view!