With the evidence provided, I'm thinking this is less of a 'player bot' issue than it is an issue of RMT.
I've been tracking PvP Matches and I'm not seeing bots so much on Aether. I see a lot of people dcing or intentionally afking, but outright botting, no.
Seems more likely that the RMT players caught wind of PvP being an easy way to exp and are shoving their character-batches through PvP to level them.
It would at least explain the disparity of players experiences.