Here’s the full quote of when the decision was made in SoD. Blizzard themselves acknowledged it was a complicated issue, partly because GDKP contributes to (but is not primarily causative of) RMT, partly due to conceptions of “traditional guild and social structures”, and indeed because GDKP has some benefits.
It’s really disingenuous for GDKP detractors to strawman the issue like they do in this thread, and accuse every advocate as a gold seller or buyer.
The question is whether the decision has had a sufficient impact on illicit activity to justify the negative side effects it has had on genuine players.