There are scant similarities between Esperanto and Invented Language No. 2 on Okrent's list, but here's the biggie: People who speak either of them are seen as hopeless weirdos by the outside world. Language No. 2 is only 25 years old and was definitely not created to serve the cause of universal brotherhood. It is not the uncopyrighted property of all humanity, but rather the trademarked invention of a major corporation. It is maddeningly and indeed deliberately difficult to learn, and doing so has no practical or theoretical usefulness, either now or in some contemplated future utopia. "Hamlet" has been published in that language too, and here's how the soliloquy starts: "taH pagh taHbe'. DaH mu'tlheghvam vIqelnIS."
(both via mamr)
