«When you run a business, if your software has a bug, your customers don’t care if it is your fault or Linus’ or some random Rails developer’s. They care that your software is bugged. Everyone’s software becomes my software because all of their bugs are my bugs. When something goes wrong, you need to seek out what is broken, and you need to fix it.»
Or why you should read the source if your shop sells custom apps on top of a framework. HN original post. This is a recurrent theme in this blog: The costs of going it alone & Working with upstream: an interview with Lazslo Peter.