In response to your query, where else are employees such as these able to grow their surly personalities and fat bottoms but in an overpaid government job? For these reasons employees in public service only leave in one of two ways; they are either fired or they die, thereby negating the need for hiring any additional staff due to resignation.
AUSU staff are non-profit, not government or university workers. Overpayment isn’t generally an issue (I wish!) – Karl