xxashxx said:
Gengar is one of the Best Ghost type Pokemon and he is also from Generation 1. Gengar's typically go for $30.00+ depending on how good the card is. The Fossil Holo Gengar went for a lot and I think it still does. Not sure how much the Fossil one goes for now but it easily went for $30.00 back then too. Might go for $60.00 if not more now but like I said not sure now.
While I'm generally opposed to estimating values of cards based on the Pokemon alone (since for almost each of them besides Charizard, the value is moreso determined by the card's rarity, artwork, and playability when in format), I don't know how much Fossil Gengar (or any other) went for when it was first printed.
However your estimate on the current price of Fossil Gengar is
absolutely wrong. Fossil Gengar typically goes for $4-7 USD.