Sorry, but the "12 Factor App" is an idea first promoted by Adam Wiggins - one of the Heroku cofounders - not by some guy trying to sell you things at Amazon. I

Sorry, but the "12 Factor App" is an idea first promoted by Adam Wiggins - one of the Heroku cofounders - not by some guy trying to sell you things at Amazon. It's also very widely agreed upon as a good way to build applications that can be easily developed locally as well as deployed to multiple environments (staging/qa/production). Whether Amazon charges twice as much to do automatically for a job you've already concluded is difficult to handle manually is completely unrelated to 12 factor applications.