You are an amazing teacher.
You already know how to inspire your students and help them to achieve their dreams. But you've still got a dream you haven't been able to fulfill yet. You have always wanted to get more education, but it never seems like the right time. You've got a home and commitments that make going back to school really, really difficult. And you're not even sure if being in a university program is the best fit anyway. All those hoops to jump through and the classes that were required but really didn't help. Plus the money. Education is expensive.
And so you put that dream back on the shelf for awhile. Maybe one day. 
For now, you read books and attend webinars and other online courses. It's good information, but it's not as deep as you want to go. There's no way a two-hour webinar can get into all the intricacies in the adolescent changing voice! But THAT'S what you want to know. You want to go into a deep, deep dive into the topic, like what you might get from a semester-long class (without the papers to write) from a knowledgeable and passionate teacher. The kind of teacher that makes you look forward to class!