I hear the point.
However, one also has to consider that those who give the courses need to make a parnosa. We don’t have a system where rabonim, teachers, etc. get paid a wage by the community at large (think terumos and ma’aseros for Kohanim and Levi’im, as an example). So the rabonim, teachers, etc. speak, write seforim, etc. and make a parnosa from that. Hence the cost.