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If I were going to write 10 unique articles and submit one to each site, then I would only get 30 backlinks. But if I submit all 10 to each site, then I get 300. If you spread your links around to a lot of different internal pages, this can do wonders....
If you use a different title at each directory, at first, you will probably see the same article ranking multiple times, but within a few days, Google's competition filter catches up and usually only one remains. But in those few days, you get more/extra organic traffic.
We monitored the search engine results closely for while. About 6 months in to the experiment, we checked our rankings and found that the page that had the article written for it was showing up as #1 when searching for its title, but the page that had no article written for it, but all else being equal, was showing up on the 4th page. This is a huge difference and verified our thoughts on article submissions.
aristotle, the article was published in only one place and just once. I guess you could call the place an article directory, it is one of the largest article publishers online and is not at all aligned with any one niche