Along with the points you mentioned, let me add few.
Opportunity to spread you talent: there are number of contests hosted by different people where you can share your talent for example, music, photography, painting , art and all.
People: Different people from different location and their culture, history and many more (could be included in knowledge) .
Steemit is a great platform where your knowledge and ideas and talent could be shared and appreciated apart from the money. Good post!!! voted!!