I forgot to mention another issue with the rebuilding industry. If they bought individual cores the core would be thrown on a pile till there was enough of them to process efficiently. That would mean money paid for individual cores would be tie up until the cores were rebuilt and sold.

If a business buys a bunch of cores from a junk yard they buy it on credit/account and have at least one month to get the Cores rebuilt and sold before they have to pay the account. That means till the account comes due the cores were free accept for transporting them to the factory to be rebuilt.

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84 300D, 82 Volvo 244Gl Diesel