I agree with easy. Just the memory and cpu. The rest goes into the motherboard box as is. Less work and more weight. That's how buyers expect them so that's how they get them. If a person wanted to get really into it, pulling jumpers, batteries, screws, standoffs and little things like that sometimes brings a few bucks on ebay... but I don't bother with that.

On another note, standoffs on lots of cases are brass.. if you want to go through the work to unscrew them.