Why should you learn a foreign language?

The first post of a blog focused on English and language learning should be inevitably devoted to  the major reasons for learning a foreign language. 

Can you add any other reasons to the following ?

What are yours?   
Give examples of academic, personal, professional or social reasons .
Choose your five top reasons.

                                                                              source: Lancashire County Council
 
Now listen to the video summarising the main reasons for learning English