I for one would be happy to shop at a store that has done the hard work for me. That is, finding compatible hardware and putting it altogether in one place. I also don't mind paying more for that service. I am as much a geek as anybody, but I find I often get frustrated combing through forums and scouring the net trying to find parts that work well together. Many times I am disappointed with the results. Being able to buy hardware that I'm reasonably certain will play nicely together is worth more than the 5-10% or so I might save buying it somewhere else.
I 100% agree with this. I'm no dummy when it comes to linux, but I work as a network technician. All I do all day is fix linux systems. About the last thing I want to do when I get home is start fighting hardware and compiling stuff just to watch TV on my plasma. It's fun to have projects and play with stuff, but sometimes you just want things to work. Things that my family has to use, I don't want them to have to fight. I would spend extra money for a pre-built kit.