Literally Nineteen Eighty-Four

The only numbers I will ever spell are one and zero, and only when using them as a pronoun, or for emphasis, respectively.

Is there ever a reason to not to use symbols when dealing with numbers? Why would "fourteen whatevers" ever be preferable to "14 whatevers". It's just so much easier to read numbers as symbols, not spelled out.

(Caveat, not including multipliers, like "273 billion").