First of all because I hate having to uninstall all of their crap (I'm looking at you, HP Support Center).
We have an HP desktop at my parents' house, so I've had plenty of time to familiarize myself with it. Granted, it's not a gaming build, but it's still a shoddy machine.
Well sure they have a lot of useless crap, but so does pretty much anything. I just don't see how you can say you're paying for trust unless you've had experience with Alienware before. The way I see it, you're paying for a brand.