We just made this post on the forums:
We've received some questions about this today based on an official response given through Support, and so we want to clarify that our policies on real-money trading as laid out in the Terms of Service and Code of Conduct have not changed at all. We have no intention of banning people just for advertising services like these.
However, we have no way to identify why you’re trading in-game currency with other players, and that means we can’t guarantee that if you’re making a large number of high value gold trades to other players that you will not be identified by our anti-RMT measures as engaging in potential RMT activity. We also can’t take action against any players who scam you out of currency or services you’ve arranged with them when you make out of game trades. For those reasons, this isn't something we can give our official stamp of approval to, and you are doing it at your own risk.
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