RE: So I just flagged a spammer with ~3400 accounts voting numbered comments..

[lexiconical]

I'm tracking something similar, although it's just the spam, no real rewards to speak of yet. Looks like potentially a similar bot-net:

https://steemit.com/spam/@lexiconical/who-is-kibbjez-serial-spammer-of-vote-bot-net-operator-harmless-programmer