Greetings from Brazil, Saviors.
I was thinking about a very good way to stop or SLOW THEM VERY WAY DOWN !!!
What about a quest in spaces between 10-10 lvls that increase the ammount of Silver you can trade ?
This little quest will receive such challenges as answering captchas within time limit, answering questions of the game and very OTHER varietys of question that each time will shuffle its answer once its done.
So, once this is done, the guy who master all these bots, must do this quest with EVERY SINGLE CHARACTER, that will spend a lot of time since he need to log in EACH ACCOUNT to accomplish this !!
Also, check my other post