The whole point of nuclear weapons is not to get what you want but to prevent others from threatening you with them; hence MADD.
Mothers Against Drunk Driving?
The service aspect is not all positive.. With a vendor built, a component failure means a 2 week minimum turnaround where you're out of a machine. If you've built it yourself it's an overnighted part and you're up and running again...and if you're crazy desperate, a drive to frys/microcenter.
I've had Apple machines shipped halfway across the US to Texas and back with a new motherboard in 2-3 days. Just saying, for reality's sake.