Well... think of a Steemit post as a competition... A lot of what STEEM Park sought to do is just this. There was a park in Brooklyn that needed amenities and momentum. @sndbox proposed using Steemit as a platform to share the narrative of the park and leverage storytelling / history to raise funds. Those funds then paid for planters and benches for the park. Today, the conservancy in Brooklyn is leveraging that project to continue to raise funds for signage.
We wanted a proof of concept that "stories" could be agents to manifest public art and build momentum for a community. Time will tell, but there's a lot of momentum building and change happening.
(Steemit blog posts are a lot like competitions, because they compete for Steem.)