$0? Are you kidding?
Poker.com.au sold for $100K and it's in exactly the same boat legally.
I agree with smee, the legal restriction is stupid. It's the internet, people just head overseas and other countries get the tax. Plus the other issue is harm minimisation - if online gambling was legalised in Australia, you can bet there would be better safeguards for problem gamblers than what an Aussie gets when they access a site based in Macau or whatever.
The other thing, is this restriction may well change. The Productivity Commission recommended legalising it a few years back but the government unusually decided against. If so, names like these would triple in value overnight.
For now, with the current laws, exact search of 4,400 and broad of 135,000 I'd say it's worth around $5K