Why do Internationals in Australia draw such poor crowds though?
Because they're uncompetitive and there're no draw cards to attract people through the gates.
The main attraction to internationals in other sports is that it's a rare opportunity for fans to see household name star players that they wouldn't normally get a chance to see play against each other. In RL effectively all of those household names already play in the NRL, and the Northern Hemisphere teams have been totally uncompetitive for 30 years now. In other words international RL is basically asking Australians and Kiwis to pay a premium for a product that's generally worse.
Add to that the total undermining of the whole concept of internationals in RL over the last 5 or so years and you've got yourself a Mickey Mouse clusterf**k that's only attractive expat minority ethnic groups.
RL won't develop a strong international game until there're at least 3/4 professional leagues regularly producing star players, and all of the IRL and NRL's attempted short cuts to a strong international scene through utterly ludicrous heritage rules are only added road blocks to that development.