I am beginning to think that ANET doesnt care about the bots. It would only take about 1 hour to ban 50-100 bots. ANET can't even say they are not sure who are bots and who are human players because my 5 yr old cousin was able to spot them within 2 minutes. He wasnt even looking for bots he was just watching the screen then asked me why they moved so weird.
Make the merchants move randomly. That takes away the second half of the bot equation. If they can't sell their inventory off, they can't farm near as effectivly.