Posted By:
davidcyclebackAs noted, the card's owner defined what the card is worth: "Something's worth what someone's willing to pay for it."
If no one's willing to pay $300,000 for the card, by his own denifition the card is not worth $300,000. If no one is willing to pay $20,000, by his definition the card is not worth $20,000.
By his definition, if no one is willing to pay the asking price, the asking price is higher than the card's worth.
So far the highest recorded sale of the card was when the owner payed, I beleive, $1,800.
By the owner's definition of worth, there is no demonstrated evidence that the card is worth more than $1,800, and there is every evidence that the card is not worth $300,000 or more.
The owner would have a hard time arging against this valuation, as it was defined by him.