Well, just like any card, it's worth whatever someone is willing to pay for it.
Unconfirmed T206's on T206Resource just means they haven't been able to confirm the card-it doesn't mean one doesn't exist. If one surfaces, they adjust the list. They just don't "assume" one is out there, and list it as a confirmed card. That would be misleading, and I'm glad they do it the way they do.
Now, it's confirmed
Sincerely, Clayton