Charging Residents to use Common Property

I know that disputes regarding use of common property are one of the biggest bains of most EC’s. But what about charging residents to use the common property and the funds going into the Admin fund to reduce overall fees for everyone (I realise the income would be taxable @30%).

What would be a reasonable charge for allowing residents to leaving various items on common property (I realise it is location dependant just want ballpark figures).

1) Car $100 per month ???

2) Rubbish bin $10 per month (assuming bins are generally kept within the lot and no bin area within the common property). ???

As far as I can see this would be legal in all states and would ensure those people who exploit the situation are made to pay.