The wear and tear on the studs can vary a great deal, depending on the bike/tire load, and how frequently the commute is on bare pavement vs. snowy or icy conditions. One way to minimize wear on the studs closest to the center is to run at or near max pressure when the roads are bare, and then back off on the pressure a bit when you have slick conditions. Maximizing the inflation pressure lifts some of load off the studs. Dropping it back down when it's slick re-engages the studs to your riding surface.