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I would say a lot of the content that is encouraged and highly rewarded on SteemIt could qualify as "Evergreen." For example fiction, true life stories, introduceyourself, videos and photography just to name a few. http://www.wordstream.com/blog/ws/2012/10/16/guide-to-evergreen-content-marketing

I agree, but "highly rewarded" is relative. You might find a few hundred dollars a great reward for a short story for a single publication, but if that publication lasted forever and never paid you anymore, making your premium version of the same content compete with a previous, free version that already had search traction, you might reconsider.