2 out of those 3 have teams in every major capital
fact of the matter is the NRL is the only "national" competition in Australia not to have a presence in each state
Only 2 out of those 3 sports are popular in Adelaide and Perth. Next to no one in these minnow states, that contain less than 1 in 5 of Australia's population, cares about RL. This fact, as uncomfortable as it is for some to hear, cannot be understated. The costs of putting a team in these cities far outweigh the benefits.
The NRL made concessions for Melbourne because it is the 2nd largest city. Having a presence in Queensland, NSW and Melbourne provides a presence in 80% of the country. It cost a fortune, more than $100M over 20 years, to make the Storm successful on the field and viable off it. On top of that, they had to pick the remains from the corpses of the Reds, Mariners and Crushers to field a competitive team from the start, which started to struggle on field and off by 2001 and had to be reinforced with the best coach and Queensland juniors of the last 25 years, plus blatant match fixing and salary cap rorts, to keep them at the top each year.
There's no way those resources will be available for Adelaide and Perth. Only a loony would believe the NRL has any desire to invest that much money in teams for Adelaide and Perth.