That's what they cost. Nokkians are the best because they have carbide studs that will last for years. Other brands (Kenda, for one) have steel studs that don't last more than 1-2 seasons depending on how much you ride.

Studded tires are an investment, but if you are going to ride in icy conditions, they are an investment in safety. And it's SO MUCH fun to ride in the ice with them!