There's No Gold Here!
While giving two years of their lives, missionaries are put in an environment where rapid personal growth and development can be achieved. As young people, they learn to live away from home, with complete strangers in a foreign place, and are expected to perform and achieve under a high workload. The missionaries are able to mature and learn how to live a respectable life, and gain many qualities and habits that will be of benefit for the rest of their lives. There's no wonder why many people would say that two years on a mission, is worth ten years back in normal life.