I actually just joined a few days ago, and I hope this discussion will help inspire my future posts.
I'm not really here for the money directly. Though I think it is an innovative tool to help direct community growth in a positive manner, I feel it should not be the main focus of my steemit efforts. Of the reasons you listed platform growth is probably the most important to me and it is also a very refreshing form of social media. Many other platforms have no incentive to create quality content and virtually no recourse for inflammatory or destructive posts. I want to watch steemit grow and effect the world at large in positive ways no one ever expected.
I'm actually still trying to find a good driver to post right now as a new steemian. I have been considering a sort of review of steemit as I see it from my perspective as a way to track developments and add my sentiment to the space. I've also been talking to a lot of people about steemit who have never heard of it before. One such person even asked me if I'd be willing to promote their art on my account!
Stay true to you my friend and contribute what you know best