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Don't get me wrong, I'm not arguing against the use of Quidditch (it's actually awesome to see it in a brutal form like this). 

It's just if you put referential stuff under the meta umbrella (using the relaxed meaning), then practically everything becomes meta - and you endless recursive loops because a work that is referenced references works itself which in turn references stuff, etc, etc. ...and then what do you do when you get works that reference each other?