I know that spammers, PR firms, marketing teams, etc will buy accounts with good karma(for how much, I don't know). I wonder approximately how much $/hour a go

I know that spammers, PR firms, marketing teams, etc will buy accounts with good karma(for how much, I don't know). I wonder approximately how much $/hour a good karma farmer could generate with techniques like this? Could it be an alternative to mechanical turk for some?