I'd go a step further - JK is there to ensure I have a job to return to.
So if I will be returning to a job over the next few months, surely it's much more beneficial for Australia if any other vacant job goes to one of the millions in JobSeeker who are absolutely battling to find any job?
If I took that job, while also receiving the higher tiered JK, that means one more unemployed person remains unemployed long term (or at very least, the company that hired me short term is out double the training costs)
Finally, the cost of keeping an entire industry alive via JK would be ridiculously cheaper than it falling over and 40,000 people going on to the dole...