I have to agree with Anchorhead here. Roleplaying/cosplaying/etc is much different from the experience of watching a film, reading a book, seeing a play, listening to music. They both have similarities, in which you escape to and enter another world, but the difference is that in one you are an active participant and in the other you are a passive observer. It's the difference between "story time" and "make believe." In the first, you listen to a tale being told and lose yourself in the story and its manner of telling; in the second, you enter the world as a character and become a decision-making part of it.