Ragnor,
There are other many other reasons to travel other than a holiday. For a start there a those who are just getting out of 14 days in quarantine in different states to where they live. Now they have a way to get home.
And regards to the WA boarder closure, you don’t need permission to leave the state, and if you have valid reasons (including compassionate) you can enter under permission.
Good call by the Govt and great to see that virgin will be involved.