Everyone is saying any cost is justifiable, no matter how high, if that is what it costs to run a school. At some point that analysis no longer makes sense. If the costs of running a school create a situation where each student must pay $500, you're not likely to have many students. But is $200 a month too high? For a lot of people, it is. That's a car payment.
BJJ is not some secret amazing magic. It's taught by dudes just like you, that have been doing it a long time. Anyone can do it. It is obviously not hard to teach at all, if the instructor is legit. It's not a chore. You just teach what youi know and do all the time, every day, and have been for years. Probably one reason everyone and their mother is opening a school. Blue belts open schools around here. In the end, a bunch of guys can throw a mat down in a basement and do the exact same thing.
Just a thought, but Yoga is a far more developed than BJJ and has been around for hundreds of years. The studio space is similar. The overhead is similar. But you would never see a yoga studio charging $200 a month.