I thought this was an interesting (if old) read about the gil-selling situation back in FFXI.
I don't want to restart the argument about the efficacy of threads like this, but I did want to ask, has SE publicly said anything official about the RMT spam in FFXIV? I know that there was a long period in FFXI during which SE effectively chose to ignore gil-sellers, which really ruined the economy. The player experience eventually deteriorated until SE were forced to do something about it (this was when the 'special task force' was created). Thankfully, FFXIV doesn't currently seem to be anywhere near the level FFXI was at before the task force was introduced, but, given that particular history, I think people are right to be concerned if SE has been silent on the issue.
EDIT: After some more googling, it seems like this was the latest word from SE on the RMT issue (someone please correct me if I'm wrong). It's certainly a fairly promising message, in some regards.