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The main object is to facilitate the construction and editing of online keys that use html. Writers can get the code and use it on their websites. It is not necessarily meant to provide the base where all key writers can make their keys available (though they can if the want).

Writing a key in Word takes a lot of editing if you have to add a new couplet 3 in a 25 couplet key and when you have to update all references to lower couplets. Here you can add the couplet and only have to edit the direct target couplets involved. All other couplets are updated automatically.
Using PDF has similar constraints, and (as far as I know) you need rather expensive programs for creating PDFs with active links.

Still, I get you point. Maybe I could up the number of free couplets...