We really really want communities to become more self-reliant and build up their Steem Power to support their own members. When we give generous votes to community accounts we very much expect those to be fully powered up - and certainly not extracted to reward individuals.

I totally agree with the goal of a community should be more self-reliant and building up their Steem Power to support their own members.
As for payout reward for the community accounts expected to fully power up, this might be a bit difficult, as building a community takes a lot of time, planning, and organizing & administering a contest, especially if the participants or members are many. I think moderators who help in the process of building the community should be rewarded/incentivized with some portion of the payout reward, as I believe the majority of those coming to Steemit and offer to help to build a community expecting that their work is rewarded.