Thanks for your question, it is a good one indeed and I was actually waiting for it. Let me answer it with another question:

Does the over 2 billion users of Facebook bring any value to it?

Actually they do, and they make it one of the most successful social media of this world, and we all know that it is a lot of lame content over there and a lot of misinformation. But economically speaking, with an increased number of users, comes a greater value of the platform. There will be advertisers who will pay for their content to be seen, there will be companies that will want their product to reach this market and this society that we all represent, and it will come with an increase in the price of Steem. There were a lot of them who took advantage of this blockchain in order to increase their popularity, and I am sure that there will be more if the Steem user base increases. My personal belief is that Steemit Inc. should focus more on this type of income that could sustain both the company and the blockchain on the long term. If a SP delegation or upvote could increase one's visibility and considering how much are people paying for that, think about it more when the userbase of Steem will be ten times higher. Or one hunderd times higher. If you can visualize that, well it will be just 5% of what facebook has right now.

I hope I have answered your question and excuse me if my answer is not that complete or correct gramatically speaking, I am writing this comment on my phone, at work :)