This IS a game, not a stock. I find it kinda odd that so many people are so focused on ROI in a game meant to deliver entertainment. It's an interest people have, I guess, so where it's an aspect of a game, it seems to capture their attention well.
I would love to see potential returns on investments added to many games, as I'd like to see how that impacts the communities playing those games. I wonder if there are games where adding such a feature actually causes current communities to dislike it. I bet such games do exist, and that experiments along these lines will reveal some fascinating things about society and how various communities view money and other societal values.
Something you don't discuss in your comment is that having better resources earlier in the game due to investing capital in it could make people glad they did it so that they can maintain an advantage over other players in gameplay dynamics. It seems possible that only the economic aspects of the game are interesting to you, given your comment. Steem's an interesting technological development that's creating new paradigms not only in social media and economics, but now gaming.
Enjoy!