Why do so many units recruit sales at job fairs?

Everyone is recruiting salespeople because they are short-lived. If you don't think you are suitable to be a salesman, then don't go. If you don't do it well, you may feel useless and want to die, but if you feel right, you can try and keep doing it. It doesn't feel right. Come out when you feel like you're going to die, and you'll be born again.