Excellent article! great stats...

I can say this, I know that like the 1 witness @lukestokes.mhth , the reason that account doesn't vote is because thats just an account @Lukestokes created to only have his witness proceeds goto, it helps with bookkeeping and other reasons, but his main account @lukestokes does post and vote quite frequently.. there are a couple witnesses that setup separate accounts here on steemit just to receive their witness proceeds too