I already do a lot of research. You kind of have to to keep up with the market. However, teaching a class allows you to take that research and organize it in a manner that others might be able to learn from it and in turn, allow you to learn from it. So I task you with this one request, teach a class. If you want to learn more about a particular writing topic, why not volunteer to teach on it. You can take the knowledge you already know and combine it with the knowledge you learn while preparing for the class. It's a win/win on both sides.
They say those who can't do, teach. I say those who can do, should teach anyway.