I think esperanto is unappealing because of its contrived and inflexible nature. It's a test-tube language, whereas natural languages are exactly like living things: they evolve continuously, and there is no way anybody can stop it (good luck, France.) Nobody tells children to invent new slang; they do it because it's the natural thing to do. It is an imperative.

Words, phonemes, phrases, and the intellectual substance they represent are constantly being recyled, created and abandoned by speakers, communities and entire cultures. It's what gives human language (and probably the human species) its strength. All language is a mutt, and apparently with good reason, or it wouldn't be universally so.

"I don't know which is worse: ignorance or apathy. And, frankly, I don't care." - Anonymous