Your idea of writing new tutorials sounds great to me. Also making courses for C2 will even be more interesting.
However, also Kiatric has many good points, which you should consider.
Why dividing forces when you can act as one? Together with a colleague at work, we are designing our first adventure game with C2. When we are looking for information, or have problems, or need a tutorial, we look here at the Scirra website. It is just not practical when in a hurry, looking at several websites.
Publish your tutorials here and link in each one to your website, where you provide (paid) courses. I think that is a very good compromise.
Anyway +1 fan for your courses. I like your idea very much, maybe you can convince Scirra to give you a platform here? Did you thought on that?
Construct 2 is an excellent tool for creating games, which should receive more attention than it receives now. But I am sure that C2 is gaining more and more momentum.
I look forward to the release of your project very much. Thank you for your efforts to share information with us.