I agree with all this (except that I happen not to be an Esperanto speaker myself) except for this:
Why not use a language you could learn 10x faster?
I am sure Esperanto is easier to learn than English. I do not believe it is 10x easier in any useful sense. Were you exaggerating for effect, or was that a serious claim, and in the latter case could you point me at some evidence?
This is a wild estimate based on my personal experience. May be a different number for other people, of course, either depending on their personal characteristics, or how much their native language is already similar to English or Esperanto.
My Esperanto exposure:
My English exposure:
If it's worth saying, but not worth its own post, then it goes here.
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