What leads a brillant student in Sikkim to work for 18k a month?

I have seen few of my friends, seniors and juniors, i felt had the potential to do something great with their life is doing that 18k job (which i don't want to undermine) when they can do so much better if the just looked at the real world. Are people in Sikkim afraid of leaving Sikkim for career? Whats the case?