Supply, demand, and upside. Movie stars get paid orders of magnitude more than top martial artists/musicians/dancers, so more people try to be actors, so there

Supply, demand, and upside. Movie stars get paid orders of magnitude more than top martial artists/musicians/dancers, so more people try to be actors, so there's a larger market, meaning instructors can charge more. Also depends where you're looking. The professional acting scenes in LA/NYC tend to choke out the hobbyist scenes (why see a community theater show in Manhattan when you can get sub-$50 tickets to a Broadway show from TDF?), so if you're looking for acting classes in those areas, they're directed at and priced for professionals.