Rather than look at wikipedia, try actual reporting.How can the RFU Premiership be more prestigious than the NRL when its attendances are less than 15k and it gets flogged in the TV ratings by the English Super League?
"Combined weekend audience of 792,000" also the Premiership Rugby salary cap was reduced in response to covid, it is typically 7 million pounds + any Test players receive bonus payments outside the cap.
"the average audience for 2021 being the highest in the last six years sitting at over 150,000."
Sky sports broadcast three games a week for a total average of 450,000.
Also 2019 Super League attendance average was 8,441. (Last pre-covid season).
In the last season pre-Covid pandemic, the LNR Top 14 averaged 14,624 per match to the NRL's 15,804. The highest regular season attendance was 43,809 while the grand final was 79,786.
Champions Cup averages that same year were 15,228.
So aside from being wrong about everything, your understanding of prestige, I have no idea what your point about PNG was meant to be? They're not a powerful marketplace in comparison to Europe.
But to keep this about stadiums, some European clubs have relatively low attendances because they own their purpose built smaller stadiums which allows them to avoid paying massive rents, which is also why none of them are at any risk of financial collapse.