The market for Fireball is very diverse. I sold my restored Fireball for $6,500. Other restored examples have fetched north of $4,000 in this area (Dallas TX).
I have seen some great condition Fireballs sell for $2K and I have seen them sell for $800.
All of these have occurred since the fall of 2013.
In today's market, I would value a working Fireball in average condition to be worth roughly $1,200-$1,500. Once the cosmetics improve, the game's price becomes higher and higher.
The Fireball that is listed for $1,500 on the market is a great deal. I just wish he was closer. If I could find a way to safely ship it for $200, then I would have taken a shot at buying the game.
Marcus