Good luck with that, this isn't a corner shop promoting racism. We can't just picket out front of their office.
There are hundreds of websites. Hundreds.
If one goes down, another one comes up.
What squenix needs is proper moderation.
There is a reason that World of Warcraft has little to no gold spamming, a part from 1 or 2 bots in major city trade chat that gets banned almost immediately.
RMT Sites will always exist, you have to depend on the company to mitigate the problems caused by them.
Just like how there are tons of aimbot/wallhackers in FPS games, you have to depend on the developers to, well.. Develop a solution to the problem.