I think your assessment is accurate and your commenters shed great light on the challenges steem has ahead. I'm not at all surprised though at the current situation. Of course most of the people here are mostly interested in steem. It's alpha-brand-spanking-new, the user base is small. Of course steem related posts get the most upvotes, the user base is all steem-geeks. Of course most of the content is steem\bts related, that is the current user base. When someone is looking to curate for profit, they will consider the user base. If all we have is steem-heads, there is only incentive to upvote steem related posts. This should change over time as the steem topic begins to cool or is exhausted. It won't happen overnight. We will likely need to talk steem to death before other categories move up to similar interest or drastically increase the user diversity.