[triplefox]

I don't think it's NIH exactly, but a certain laziness and unwillingness to try anything but the simplest(even stupidest) solution. My observations and personal experience indicate that a 10x will reuse formats, languages, and protocols, and they'll use libraries for the purpose of taking advantage of those things.

What you won't see reused is more high-level functionality. That's where a lot of assumptions have to be made about the program's internal structure, and it's where getting too generic and open-ended makes things very complex very quickly.