I have posted a few times on exactly the topic you claim I am not seeing. I have made the exact points you are making here - I did that over a year ago. However, I have since realised that there really is nothing to 'optimise' without the system being deliberately made attractive to investors. The mathematical reality is that the inflation process is where the rewards come from, in combination with the investor money. The inflation process means that investors will lose their money if they don't take action. It's up to them to decide whether they are best served by upvoting themselves or trying to get their money back another way.

I'm not really sure what you are suggesting as a solution here. Investors can take action to increase their rewards, whether it is through curation or authoring posts.