I know how much people hate kaptcha but if you use it upon vending or npc transaction even if it is 3 digits on a randomized on screen input or a 3-4 letter randomized word input you'd get rid of a ton of them,since most of these farmers run bots on several games i sincerely doubt they are going to babysit them that adamantly to keep them running. Games such as Wakfu that use similar setups have pretty much 0 gold sellers on them.
Edited by Anakron, 23 January 2015 - 09:57 AM.