Whales with big amounts of Steem or Steem Power should not be rewarded with curation rewards lineairly corresponding to their large stake. This only leads to rewards and interaction to gravitate more towards the whales themselves, but as we can see it does not help for increasing the value (attractiveness) of the platform, or the value of Steem itself.
I think the reward settings should be tweaked to really incentivize human manual behavior (less automation, maybe a reward-penalty on automated actions) and encourage new and beginning users that post, comment and upvote good content.
This way, yes, an investor would see much smaller returns as rewards in Steem, SBD and SP. But, the value of these currencies could dramatically increase. And this would be infinitely more valuable to an investor (since they already hold a large bag).