Most kitchen gadgets are unnecessary (you really just need good knives, spoons and pans for the most part), but just because something is unnecessary doesn't mean it's not worth owning. The Fondoodler is absolutely worth owning, even if no one ever actually needs this in their lives.
After all, do you really need a "hot glue gun" for cheese? No, but don't you want to make ultimate nachos and pretzel houses held together with Swiss cheese? How could anyone say no to that?
You can get your hands on the the Fondoodler from Amazon.