People want to see realism in action now. People want the actors to perform than the computers performing. Though I have done both, I enjoy the realism of action more.
To be honest I had learnt martial arts for a girl. So I started learning the art to impress her, but eventually I started loving martial art more than the girl. So later it became a habit it became fun.
Mixed Martial Arts is wonderful to watch, it is very practical but dangerous at the same time. You have to be very careful when doing something like that.