I don't agree with the idea of speaking more than 3 languages, cause the language is not a peace of cake to be learned and completely done by the learner, So it would be a good idea to be perfect in one language while you know a little bit about the others [speaking for instance ] .
And as all of us know that English has became the international Language which most people from all over the world communicate by .
As for me, i am learning English cause i LOVE it so much , and wanna be a teacher.
With Regards