the reward curve, in my opinion, increases the incentive to use voting bots to upvote your content
People will figure out how many rshares are needed to tip the curve. Bid-bots will have that as a minimum bid amount, and nothing will change (except that smaller accounts will be priced out and the incentives to consolidate stake will reduce scale of bot-nets).
The real issues are not economic or distribution issues, they are philosophical. As long as the prevalent perspective is that somebody (anybody?) has the right to dictate how others use their stake, there will always be conflict around how stake is being used and how rewards are distributed.
