Lets assume in this hypothesis that all the places that the articles would be posted would be high quality pageranked pages and sites.
I understand that the articles uniqueness will help it stay in the live index. So if you are using your articles for actual traffic generators, then a unique or spun article is required. But If you true goal by posting articles is to get a link; does it matter if the link is on a unique article? (assuming the article is on a high PR site or page)
Now I do understand that if 50 identical articles are posted on 50 sites, all at the same time, 49 of those pages will go to the supplemental index. (maybe a little less) But Google will cache and index all of the pages if the sites are decently pageranked.
So the real question becomes; do links on pages that are in the supplemental index help your site?
I hope to hear some good responses.