Why should you care? Well, no-one else can answer that question apart from you. Do you care if your blood sugar runs high? Do you care about developing complications? Do you care about the people who would have to care for you if you do? Do you care if your time is cut short?
You obviously do as you've managed the hardest one of all, still struggling with my old mate nicotine. The best thing about diabetes for me, is that its up to me to control it, no-one else can do it for me. Which is lucky for me as I don't trust anyone else, especially doctors. They tried to make me take statins, I refused, changed my diet and my readings are all good now. So, its kinda up to you, do some research, make some changes. And look after yourself! No-one else will. Good Luck.