In 2018-19, Western Australia's gross state product was A$260.6 billion (14% of Australia's GDP), making it the nation's most productive state with a GSP per capita of A$100,367 (compared with the national average of A$74,605).
Perhaps the less productive states should pay attention. In 1933, 2/3 of the voting population voted in favour of secession. Only the pommy government at the time stopped it from happening.