If the prices are very expensive in one state, then simply buy from another state like QLD where prices are dramatically cheaper than all other states. 

Obviously!
Now add the freight cost ( approx. $350 for a decent courier) ,the risk of buying sight unseen and hoping you are not copping it in the axxse, no insurance on pinball machines to try and cover yourself and to top it of getting LOST in transit.
In an ideal world you would be correct.