You can tell, based on what we are badgered about in the UK at least, what stuff is presumably expensive to treat: drinking-related stuff (health effects, viole

You can tell, based on what we are badgered about in the UK at least, what stuff is presumably expensive to treat: drinking-related stuff (health effects, violence, general misadventure), smoking (esp. tobacco), eating shit food and not doing any exercise, driving too fast or carelessly and getting into an accident (see also: drinking). I've never seen anything about martial arts, or indeed about sports in general. I'm sure it costs more than £0/year to treat the resulting injuries, just not enough more to make it worth worrying about by comparison.