I suggest that payouts are based on the total value of comments more than the amount of votes on the content. This way auto-votes have less or no impact on payouts and thus there is no incentive to use them. It could be that votes on posts determine visibility and ranking, but votes on comments determine post payout.
Let the value of the social interaction determine the value, not the cold calculations of bots.
Thanks again @krnel
Upvoted by a human and re-steemed!
Unfortunately that system would be unfair to authors, unless you mean curation rewards should come from comment upvotes ...