I've lately been reading this Narnia deconstruction

http://www.anamardoll.com/2011/02/narnia-narnia-deconstruction-index-post.html

She didn't finish the whole series, but that's all right. It got me thinking a bit. The whole "kid from our world goes to fantasy world and saves the day" trope is exceedingly common, which has to mean that in Narnia type worlds, the publishers are churning out books about kids coming to strange lands without magic and saving the day. That's got to be how it works :)