Which do all tragic plays have in common? W I L L G I V E M O N E Y G I V E M E C A S H A P P a dark sense of humor
an unhappy ending
some level of sarcasm
miserable characters

yes, we appreciate these things!

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.

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