A company that uses Drupal for their day-to-day work but doesn't contribute back has something fundamentally wrong. Some are worried about losing money on non-billable time, but inside they're really just missing the point of open source altogether. They have no sense of the Drupal karma: we feel like helping because we wouldn't know Drupal without someone helping us. Plus, they're really doing their developers and company a huge disservice by not letting them gain reputation or benefit from code review and collaboration.

Drupal may be free, but it comes at a cost.