Couple of yrs ago i got done. In NSW They will fine u for the below:

Driving an Unregistered vehicle $500
Un-insured vehicle (greenslip) $500
Unpaid tax/stamp duty $500
No valid rego label $68
Unpaid registration fee $400
Unregistered number plates. $90

Just over $2k for all fees in just less than 5klms ride.

Take note if its double demerits the fines are a tad higher.

My advise, dont risk it unless it was life threatening.

Or your a baller.. Go for a ride! Wgaf right? Lol