RSS most generally stands for “Really Simple Syndication”. A term used for syndicating or reiterating or repeating information. Unique information has a much better chance of being fed on another persons site, newsgroup, blog, or social networking site than information that has already been published.
The seo advantage to having your rss feeds picked up and placed by other people is the back link aspect. The feed will be coming directly from your site so any links within the article will be yours and will point where you want then to point.
Bottom line, any relevant links coming back to your site are beneficial to your site optimization.