You don't need 900 GMs to do better than they're doing now. You have characters spamming shout for 8 hours or more without getting banned. 1 person could visit the 3 citys in all servers and ban the shouters in less than 8 hours. The way it is now, even if they had 1 or 2 GMs to deal with these shouters, and both of them were slow and lazy, they'd be banning these accounts faster. So either they have no ingame support for these violations, or they don't care to do anything about it.
I'm not saying banning shouters will fix the problem, but it'd sure as hell be a start. As it is right now a RMT company can steal or buy 1 account and get between 8 hours and days of advertisement out of it. Do a cost benefit analysis. It's a great business decision. Start banning people after a few minutes, or even an hour, and it isn't as cost effective.