Sort:  

It would suffer from sybil, whales could just divide up their balance into multiple 200 MV accounts and use the bots to vote with all of them, thus earning rewards again.

@jesta to prevent sybil, can we give moderators extra power? Say, a moderator with 300MV can nullify upvotes with 3000MV. Then we may have the issue that one moderator can counteract another moderator, however that's easier to be solved as it's an issue of a smaller group.

answer to @jesta (nesting)

It would suffer from sybil, whales could just divide up their balance into multiple 200 MV accounts and use the bots to vote with all of them, thus earning rewards again.

What if we include TIME in the equation?(!)
200MV that are 6 months old should be "stronger" than 200"fresh"MVs

If users could earn curation for accounts under 250 MV, then the incentive for the whales would be to just split their large accounts into lots of 250 MV ones.