One reason is because there is more than one of you. By using Puppet, I never have to read my colleagues custom setup script because store it there. By checkin

One reason is because there is more than one of you. By using Puppet, I never have to read my colleagues custom setup script because store it there. By checking in everything to version control, I see who has done what by reading the changelog. If you are only managing your own servers and keep a strict discipline you will see less of the benefits.