Gold Farming is now punishable by Death in China.
You think you're joking.
When I landed in China for the first time the pilot got on the microphone and said "The Chinese Government requests that I remind you that bringing drugs into The People's Republic is a crime punishible by death. Welcome to China."
While on the mainland I saw several news reports explaining that SARS was a biological weapon developed and released upon the Chinese People by Russia.
My tour guide in the Forbidden City explained that practitioners of Falun Gong (basically old-school Tai Chi) advocate killing your family then committing suicide. The American equivalent would be someone claiming that people who practice Yoga are secret cultists planning to murder your children.
While touring Tiananmen Square I tried to joke with my guide by saying, "Hey, didn't I see you on TV during the '89 protests?" Bad idea. He became very serious and explained that even 20 years later if the government found evidence that he was in the square that day he could be imprisoned or executed.
It's China, they can enforce anything.
I'm not familiar with the Chinese justice system, but I still wonder if they will be able to enforce this. RMT shops aren't likely to just shut down that easily.
I looked up three internet cafes in the village where I would be staying for the first half of my trip. By the time I got there ten days later, the government had shut down all three shops. No explanation needed, no posted notice, nothing.
The level of control the government has over the people is practically unimaginable to anyone living in the West. I met some local townspeople at a village karaoke bar and when they heard I was going to the Great Wall the next day, they got very jealous. They live 30 minutes away from one of the ancient wonders of the world but they will never get to see it because the Chinese Government will not grant them permission to leave their county. For local farmers and village people, the only way to get permission to leave the county is to prove that you have a job lined up in the county you are travelling to. But good luck getting hired in advance without interviewing in person.
It used to be that you couldn't just go to a store and buy food. In addition to money, you had to show the market owner a government issued certificate authorizing you to purchase food in that county. If you want to go to school, you have to register and attend in the county where your mother registered and attended.
I could go on and on. Yes, things are far far better now than they used to be. But if the Chinese Government can tell their people where to live through harsh residency laws, tell them what to think through state-controlled news, close internet cafes and other businesses at will, and restrict/censor entire sectors of the internet, they can easily shut down gil sellers. I would guess that for most gil sellers, just hearing that the state wants them to stop would be more than enough.