This is what I'm doing about it.
https://steemit.com/steem/@l0k1/introducing-smackdown-kitty
Self voting by big accounts is definitely a drain on rewards especially when it comes to achieving the objective of rewarding quality, as measured by our peers. And there will be a tsunami of spammers coming if we don't address the problem quickly, and they have the potential to outdo the incumbent self voting whale population.