You know, ArenaNet's not the people you should be talking to. You really should be lodging your complaints towards the Asura, the ones who manage the waypoint network (seeing as they created the dang thing). Your best bet would be to speak with the Arcane Council as to why they haven't done anything about the situation. This is also a terrible idea because......they're the Arcane Council. They will most likely not give you the time to speak with them seeing as they are either way too busy or have far more better things to do than listen to a little bookah. Then again, they may listen for a minute and then politely sweep your request underneath a rug. OR maybe even perhaps they can't do anything because since the waypoint in question is in Lion's Arch, that it is then up to Ellen Kiel and the Captain's Council to get the ball rolling on figuring out how to clean up the city despite having what feels like an eternity to deal with it. (Oddly enough though, maybe the Captain's Council actually needs to sell enough "Eternitys" to raise the funds) Of course maybe the real reason is because of some long-winded, back-and-forth banter involving too many groups for some reason that nobody really knows why they got involved in the first place.
TL;DR - Because...politics.