I didn't downvote or upvote you, but here's my feedback:

-I disagree that learning (non-english) languages has a high value/cost ratio. Thus, I'd rather not see the enthusiastic exhortation in the title (though I would be much less opposed to it if I thought that you were exhorting people to do something which actually did have high value/cost ratio.)

-I am fine with/appreciate the bolding, italics, and caps -- things that help me grok someone's emotions as they're writing something like this are appreciated, because it lets me get inside their head better.

-Citations would probably be appreciated on most things.

-This is unlikely to be generalizable to most of your audience, but I really don't like things that require brute mental force -- they don't hold my attention.