Those who fill out the Qantas company survey will note that you can fill it out as many times as you like. Management get bonuses related to the result and thus get a financial reward for positive feedback. I think it almost certain that there are a bucket load of managers who fill the thing out at least 10 times each.
Complaints in the past about it not being accurate have been ignored. Any change would make it harder to rort the system.
The real results will be published after the survey I have posted on here is closed.