One place you can get a professional domain appraisal is Afternic .com
It is something you can show a potential buyer, it gives a low price and a high price range for a motivated buyer.
This is truly a premium name in a place where gambling is very popular. I've read that people in North America go to Vegas to gamble for fun, whereas when the Chinese go to casinos, it's like they're going to war against the casino, and it is a test of whether they have good fortune or not.
Macau is a tiny part of China, close enough to HongKong for a day trip by public boats (which are on a schedule), and Macau already does more annual gambling revenue than Las Vegas. That isn't a typo. Mega casino/resorts/conference centers are being built there right now, most by LasVegas casinos who see Macau as becoming the "Las vegas of Asia". There is something like 2 billion+ people within a 3 hour flight of Macau. These casinos are being set up on reclaimed land called the "Cotai strip", in a similar fashion as the "Las Vegas strip", and will start opening around late 2006/2007. Gambling is LEGAL in Macau. I could see Casino.hk as a site that advertises or promotes the legal gambling opportunities in Macau in some way. They are trying to make it a travel destination, and it has an international airport already. So tourists can either go directly to Macau, or if they are going to Hong Kong, then Macau is an easy day trip away. Good luck with your name!
I'd appraise at upper x,xxx to low xx,xxx right now, but will definitely increase over time.