All that the BSD-licensed code does is make a few select parts easy. So do IBM, Nokia, and a lot of other household names. Entire businesses and careers have been built on BSD-licensed code. If the University of California, Berkeley, had not opened their code base under such a non-restrictive license, none of this would be possible. Such intelligent appliances would be far more expensive for both manufacturers and consumers.
Some companies make a good living off of open-source projects.
BSDi sells server operating systems based on the BSD UNIX code base. Code from the open-source projects has been incorporated into BSDi. The biggest reasons are cheap debugging, wide test base, and recognition. Open-source developers are quick to point out flaws in code, especially in a project that focuses so much attention on correctness. Other companies have taken FreeBSD code and not returned anything.