90% of all people do less on the weekend than they do during the week. If you can hire for your team only people who have an active social life and engaging hobbies, your productivity will go up significantly. Think about it, look at the person sitting next to you. If they are going home to get suckered into watching makeover shows or a football game they don't care about, that is only marginally better than being in the office. However if they are going out to dinner with friends or training for a 5 mile swim, or volunteer at a woman's shelter, that is much better than where they are. So those people are going to get their stuff done, so they can move on.