I kinda see where your coming from but I think restoration cost does play a part or perhaps more importantly restoration process if a car has been fully restored no expense spared this will determine the value greatly as well as supply and demand but if you overcapitalise which is easy to do say spend 80k on a resto you will probably still only get around 50k for your hard work, people are out there that dont want to do the hard yards or dont have the time but have the money and will pay the premium prices, It will be interesting to see in 10-15 years what they are worth I have heard that thrown around before that the value will drop due to the generation of people wanting them decreasing but why is this not so with older type cars like hot rods or early Chevs etc, and as far I know EH Holdens are still pulling good money from what I see to fine and full restored one you are looking at 40k plus I am not talking stock EH. Will there be a spike one Holden stops local production and will some various models of the Commodore or HSV line also spike in value and demand time will tell. In regards to the GT's and Monaro's that pulled huge dollars those days are long gone and the owners will never recoup there money as there were other factors at play that steam rolled those increase in values. End of the day you will pay what you want for a car if you want it bad enough unless your unrealistic or a tight arse
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