I personally like KE, especially with a 3 threshold, there are a lot of flexibility of selling. I have no issue with selling as long as people don't exploit.
I also introduced comment and reply ratios here
https://peakd.com/hive-133987/@azircon/democracy-dies-in-silence
Together, I think it is enough.
I don't want to overdo this, because more rule you implement, more borderline cases there will be, and then it lost its purpose.