As far as the ice wines, it is because of higher costs of the juice for the kit, In order to make a true ice wine, the grapes need to be grown in a very cold location-like mine or colder. You don't harvest them at the normal time, but let them hang. You leave them there until December to January so they can be harvested while frozen. The act of hanging and freezing and drying tends to really bump up the specifice gravity (sugars). Birds and other animals and possible disease all take their share of the crop. So instead of harvesting 5 tons to the acre, you might get a couple tons. Then the grapes are pressed while still frozen so that only the high sugar juice flows, giving you a typical brix of 35-40. That makes a fairly high alcohol wine, but ends up with a lot of residual sugars. This results in a sweet desert or sipping wine.
So that is why the ice wine kits are so expensive! By the way, a typical 375 ml bottle of ice wine will run $35-50 for a run of the mill one.