any evidence off banned accounts? nope... they're just a bunch off Chinese students who work a few month at a gold farm company to earn some cash. None off these people do know something about Runescape as game, they're just told to do something in game which complete the orders for the big bosses. How do I know? Just ask something about the game on the gold4rs live support, they don't know anything at all...
Also I've a colleague who lived over 10 years in TianJin which is a bit south-east from Beijing. He told me that some guys he knew where gold farmers, they had to work in shifts for only 8 hrs. Therefore gold farmers are mostly students who're in need off money.
On Youtube they have very nice documentaries about gold farmers, I recommend you take a look at a few before posting?
Here's a very good documentary about them made by "Ge Jin"
Click to see