It requires that the law recognises virtual items as real goods. Then you can get a civil suit working.
It's also something that whining on the forums or posting online will not always address, but send them your missive on a piece of dead tree will almost always get a result.
I've gotten my account banned from WoW because I was too influential on the in game economy, and that offended someone enough that they wrote to acti-blizz. They then crowed about it, and how they now get to make thousands more gold a day from overcharging, I mean fairly competing, in the market. Person who made the complaint got banned after another few months for gold selling.
I only got the actual reason for the ban by also writing a letter of complaint, since I'd not (as far as I could tell) violated the T+C, no using hacks or bots. I'd gotten suspension before for transferring large amounts of gold around, but that got reversed.
I got a refund on the time left on my account, but no characters back. A bunch of the cool stuff is BoA now anyway, so I still have titles, 'chevos, hierlooms and a zillion mounts and pets.
Blessing in disguise really. Made me re-consider how much effort I was putting into a game that wasn't paying me any money. Yeah, I could have made bank by gold selling, but then that would be a perfectly good reason to ban.
Online poker is far better way to spend my $15 a month :D