Casinos seem to have proliferated on nostal and they are as annoying as hell, not to mention obnoxious when these people try to relieve kids of their gold who have no idea how probability/chance works.
Why GM's are allowing it is beyond me. They weren't allowed to be advertised on retail either.
Blue quote;
Though I believe it's been covered I wanted to clarify: Using any method of communication in-game to advertise a casino or other form or gambling would be a violation of our policies. This includes /yell, /say and /whisper.
You may otherwise run or participate in one in-game as long as in doing so you are not violating other policies (i.e. spamming, scamming, etc...).
(http://us.battle.net/wow/en/forum/topic/2965116489)
Kinda tired of cleaning up my ignore list to add new casino bs spammers every day.