Regular and consistent contact work with teenagers (or any of the people within your sphere of influence for that matter) is the most effective way to disciple, lead, and influence others. I believe in the 'program' and what it means for the community, but nothing replaces church - that face-to-face time in the name of Jesus - outside the walls.
I stated my reason for the question of "Why" for Contact Work in my previous post titled, "Doing Healthy, Faithful Contact Work." I want to encourage you to read that post before continuing with this one, especially if you wonder why contact work is necessary. In that post, I share my own story of how one event at a high school football game forever changed how I lead in student ministry.