It makes sense that this school would have lots of classes that only get one or two students.

For example, the Ethics of Mind Reading would be an absolutely useless course for most students, but would be vital for those one or two gifted with it.

Tai Yang could take any amount of classes on "Learn how to use Fire Manipulation without killing everyone", but that will not help him. But it'd be a good class for those with fire manipulation, or those with latent abilities for fire manipulation.