After you complete your course, we will send you not one, but two copies of your completion certificate. The first is, of course, for the court. The second is for your insurance company.
Most insurance providers offer "safe driver" discounts for policyholders who have completed a defensive driving course. Your lower premiums will stay in effect for three years and the savings are usually enough to pay for the course and any court fees with money to spare. Who knew you could actually make money by getting a ticket?