The highest ROI even for smaller accounts is to find unknown content that figures to be successful once it becomes visible and vote on it.
If there are N low-reward posts the odds of finding one that will be a hit are very low. Is there an effective method for finding posts that "figure to become successful"? If there is why aren't people using that mechanism today? Is the argument that they're not but they would if curation rewards were ~2X what they are today?
Voting mechanically for authors with the best track record doesn't work to generate the highest return because you have to vote earlier and earlier to get ahead of everyone else doing the same thing, which then reduces the curation rewards (the system docks them back to the reward pool for votes before 15 minutes).
Do you have some kind of evidence or analysis for this assertion, or is this speculation?