From the point of view of developing your brain, leaving your country is a free education in itself. There is also the effect of embedding yourself in a network of expats made up of the best and brightest from countries all over the world. That all comes on top of the education you receive. And if you are less in it for the intellectual stuff and are more into drinking and partying, college life in the US is pretty lame compared to some university towns across the world. Cheaper, wilder, better.