Being a federal politician can't be easy.
Imagine the protocols, rules, how policy is developed, getting information from the APS, what to declare, how to bargain with all the others without getting screwed over, your every mistake and misstep scrutinized by the press, working and networking all hours of the day and night.
So if we don't want professional politicians, then we want "normal people" from all walks of life who can also be media experts and able to understand the implications and anticipate consequences of complex legislation.
Which means that in most cases they will be heavily dependent on, and guided by, their staff.
Who elected them (the staff?)