...With the average annual cost of running a family sized sedan estimated at about $10,000, the new system is expected to help drivers recoup some of the on-road costs....
To get a number of $10,000 you need to make some extreme assumptions, eg, a new car costing $30,000, bought with finance, fully insured then driven 20,000 klm per year.
I own a family-sized wagon (98 VT Commodore) and none of those assumptions apply to me. I bought it second-hand, paid cash and drive about 3,000 klm per year. At 15 litres/100klm fuel consumption, I estimate its costing me $2000-$3000 to run (including rego, insurance and maintenance). Still a lot of money, but with needing to transport wife and kids and doing my own home renovations its a necessity.
I haven't actually tried to carry 10 bags of concrete and 50 pavers on my bike but I'm guessing it wouldn't be easy.