Hmm, so this first blog should be easy, given I work for Young People Without Borders! Although it's a Friday, so that never bodes well for creativity.
If I had to convince one person to be part of Young People Without Borders, I'd say you should do it because of the people you'll meet. Some of my best friends have come from my history as a volunteer (ok, let's be honest... all of my best friends). There's something so nice about finally finding people who are interested in the same things as you, who are interested in the world.
That's the main reason I stay involved, because the people are legends!