Respostas
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1- You will feel a lot smarter when compared to a good percentage of our country - I'm being very sincere here - without english you are limited to such a small content of the virtual world that it definitely means that the "knowledgeable" part of yourself in reality probably has very low standards.
2- You will be more prepared to the business world, since truly good companies have the necessity to acomodate an english speaker at service - it is mandatory. So it means that beyond a certain level, you can never really go up, without english. Above this level - everybody speaks it.
3 - Girls will definitely look at you as a very smart man, and a very intelectually competent person when you say that you fluently speak english.
There - 3 reasons.