Usually a huge number of skills is needed in order to complete successfully a Drupal project, like: server management, web stack management, database management, knowledge of drush, Drupal profiles, frequently used modules, common Drupal development patterns and paradigms, etc. A new Drupal developer cannot possibly get all this skills in a short time, so he is not able to finish properly a Drupal application or it will take him a very long time. DrupalBox offers them a Drupal solution that works out of the box, with reasonable settings and configurations, which they can use as a starting point for developing their application.
DrupalBox can also simplify the life of the experienced Drupal developers, by allowing them to get started quickly, and then customizing the solution as needed.