It doesn't update the price in the copy because IMHO it isn't necessary. Noone is going to go all the way to the bottom of a product page, select an option and look back up at the top to see if the price changed. All they have to do is look at the options/attributes and it is quite obvious what the total price is. They click and are on to more shopping or checkout. IMHO you are trying to make it too hard for the average person to use a site.

Shep