I would think this is pretty close if not even low. I could be wrong, but I though a JP one sold on yahoojapan a few years back for around this price.
Me personally if I had to guess, I would say $35,000 to $45,000.
There's a lot of desperate old dudes out there with way too much money to blow, that have probably been saving for years to obtain this game, and will spend "whatever" just to get it and complete their collection.
Someone would probably get a private loan just to get it at this point.