Sorry but you make no sense, buying low and selling high is ok as long as it is done by casual players. Typical Chinese gold farmers are swarms they are doing it non stop for 7 / 24. That happened in retail vanilla and what blizzard did was to ban sellers also buyers, after that i rarely saw any gold sellers.
I'm pretty sure developers have scripts to track gold transfers and i'm sure they'll implant it in time. So please just don't say stupid things like "are u advertising gold sellers".
Unless u're total douche bag you wouldnt bother to create a fake screenshot of chat screen and if you even do that you will get caught and will get banned.
I dont understand you people, instead of try'n to stop those spammers / sellers, we should just sit and do nothing? If they ban few hundred sellers and buyers i think they will get the message. No one wants to grind from scratch at vanilla.