One thing is free upvote to counter DVs (which should work well IMO) but the other is whole upvoting culture on Hive. Curation rewards cannot be only one factor. We simply have no access to data about account's past behaviour on the blockchain.
-Powered-down/earned author reward ratio.
-Self-voting index.
-Usage of voting mana.
All these informations should be seen by default on the users profile on major front-ends to avoid rewarding drains and exploiters. It would say much more than simple reputation.
There is a big responsibility coming with voting, embracing it fully may be only a value for the community.
that is a good idea, to simplify, it could perhaps also flow into the rating value