Unfortunately it´s very hard for smaller Users to flag efficiently without loosing all your Voting Power. I used to make some nonsense disappear on my blog but basically just ended up wasting my Votes, which I could rather have spend on good comments or Posts intead...
Therefore I´m really greatful to hear that you and as well other whales try their best to get rid of those Spammers. Thanks for that @lukestokes!
Yeah, I do think it's something people with more voting power should step up and deal with more often. Also, don't forget, you bring attention to the abuse in the steamcleaners chat channel or via similar projects.