While having in-house solutions is great, but what happens when people move on?
I work in the EDU part of the IT industry, and we have a particular system that was designed by a former employee, picked up by a second, redesigned by the same person, who denies that anything could be wrong with it. Support calls to them go unanswered, and they're rarely in the office. And they are one of the three Directors in IT.
Personally, I work on our Windows 7 deployment, and all the underlying AutoIt scripts, plus the virtualization of our applications. I have trained all of my colleagues in what they may need in the event of my demise (or less worrisome event). And I get paid about $34k a year.