They're there to make a profit, as much as possible.
TV advertising ain't cheap and they've got to pay to move the car from wherever they buy it to wherever they sell it. Auction at a guess, nearest to the seller.
Their only income is the difference between what they pay you and what they can flog it for.
I wouldn't be surprised if they're the same companies that buy your gold, and they've been 'outed' in recent radio and TV programs as paying as little as 10% of what you can get from a high street jeweller.
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