How Much Are Video Game Castles Worth?

Maxim has cranked out a bizarre article that attempts to estimate the value (in gold coins, no less) of some of the castles prominently featured in various video games, including Fable II’s Castle Fairfax and Morrowind’s Castle Karstaag. Apparently the two guys coming up with the numbers are “real estate experts”:

Castle Karstaag, The Elder Scrolls III: Morrowind

DM: Tailored to those who love a winter getaway, Castle Karstaag rivals only the Fortress of Solitude as king of the ice castles. Oceanfront location makes it a covetable castle, although the interior could use a warm touch for those who easily tire of icy designs. Spacious throughout gives you room to entertain even the largest of guests and rearrange room structures at a moment’s notice.
Estimated Value: 650,000 gold coins

SECOND OPINION
BB: Built almost entirely out of ice, this oceanfront castle has a great view. A neat feature is the bedroom with a built-in pool I hope it’s heated! The large dining table in the banquet hall can fit giants and the ice torches never, and I mean never, burn out.
Estimated Value: A cool 1,500,000 gold coins

But what’s the current currency conversion rate for USD to Tamriel-issued gold coins?