This isn't just any Yu-Gi-Oh card. It is apparently a one of a kind Yu-Gi-Oh card. And it's one that has an astronomical price tag: a cool ten million bucks!
You might get $2-5 million, but not $10 million.
More like $1,000 - $3,000 if even that. Regardless of how rare / valuable / unique an item is. The value is exactly what someone is willing to pay for it. I don't imagine there are many (would honestly believe there are zero) millionaires playing Yu Gi Oh, so the value is instantly under 1,000,000 dollars.
I'd buy that for a dollar
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