The answer to this question can be easily answered. Yes, it is expensive, but keeping yourself healthy doesn't come cheap. You will be giving more insulin injections, testing your blood more frequently, and subsequently visiting your Diabetes Team more often. It will make you dig a little bit deeper in your pocket book. If you look at this in the long run you will be actually saving yourself money and you'll have your health. Since you have kept yourself healthy and in good control you won't be prone to as many complications, if any, later down the road.