I could understand that if Steem price was supported by companies or ads therefore creating revenue in the form of Steem, sustaining creators and payouts. But as far as I know there's no plans for that in the near future. So you analogy doesn't make sense to me in the way it's currently laid out. You buy a stock based on the perceived company value and the chances for that stock and company to increase in the future.
RE: Where Does the Money in Steem Come From?