WA is strategically important to NRL for those advertisers seeking a more 'national' reach and wider spread of eyeballs. It's also important for TV ratings to get that additional time slot. It's also important for Australians' perception of where rugby league is played ie 'dots on a map', that the NRL is spread out nationally. It's also important to NRL for attracting sponsors and advertisers that have large presence in WA with their heavy mining industry.
So there's many reasons for the NRL to seek out WA beyond just the population numbers. It would definitely make more short term sense to stick another team in Brisbane but there's lots of reasons to gain a foothold in Perth.
The use of the term " important " I would push back on. It's as important as icecream after dinner, desirable sure.
The national footprint argument is silly, NRL is INTERNATIONAL . Another team in NZ south island and PNG .. If we're talking about dots on the map.. ? We're going to need a bigger map . Advertisers and sponsors are looking for numbers, they don't care where they come from and WA won't bring a lot of them, same can be said for TV rights.
The extra timeslot is also almost completely irrelevant. It only offers 1 time slot for 12 games, they won't playing the same timeslot out of 8 different ones, so it's 3 or 4 games at Best.
You make points, are they significant? Not even close.
Anyway, I want a WA team, because it will be cool.
I think that the best case for a Perth team, a legitimate case is that it will be really cool! Our unique little franchise out West..could even become big! Either way, it'll still be cool.