The OCD stuff is a good idea for giving communities a bit more interest through the curation side of things but it's only really a temporal solution.
OCD is great. It takes a while to grow too big for OCD support though. And in the meantime I keep growing the stake of my community account and gathering delegations to increase the upvotes and curation rewards.
Commentrewarder is also nice, but it needs to be done by the author itself.
I'm playing with the idea to setup a curation service to rewards comments, but I need some time to develop.