You have NO idea what a bad update can be.
We do updates to our cable boxes to employees first, so that we can find any potential show stopper bugs.
Once we didn't. And it caused us about 3 weeks of excess truck rolls (read as $$$), and customer aggravation, and wasted time by the poor shmucks (me) in the field.
It's SMART to do test roll outs first. And as Vzn can't be sure to get enough of a test pool with employees, I can see random sampling as a solution.
There are probably better solutions.
Think of what you would be saying if this was like the iPhone 3.0(?) roll out where ppls phones would just DIE. You'd be GLAD you hadn't updated yet.