Honestly, I think many don't have the aptitude (or perhaps the attention span) to do anything close to useful testing. If it ain't plug and play, they don't mess with it...

I grew up in the days where you really had to know some stuff about computers to be a user. Not saying that it should be that way now - I mean it's nice to not have to know so much, but it sure does help to at least have a fundamental understanding of the hardware and software.