By definition, poker machines are strictly for those who have no idea of how to gamble sensibly. This ranges from those who can't stop to those who haven't a clue.
The addicts sense that they are being fleeced but are powerless to stop, most simple punters don't realise what a rip-off the machines are and sensible punters aren't tempted at all.
I'm just grateful that I live in WA and that the only time that I have to put up with the infernal machines is when I'm forced to go to the casino.
A final thought: To restrict use, make punters use an ID card on each visit and use that card to monitor each punter's spend. A daily limit of $100 to $200,would at least put a brake on individual losses.