curation rewards should be 75% and author 25%. So its not the best to power down and sell. More profit is for an author to stack and reward own follwers and community to get vots back ( because he gets 75% back and reward others.
The system needs to build the most profitable way = the way supports the system.
Now it isnt.
I tell this since years, i would buy way more steem if this fixed.
If you want people to not self vote, it should probably be more like 90%/10%... but 75%/25% is a good start. 50% is not enough.