Half of the geek squad agents at my store give me more insight on building my pc than the people here on tech-forums.
That is to be expected though, this site is for the most part comprised of 12-16 year old fanboys, who know the very basics when it comes to hardware (eg. they know that this part > this part). I would hope to god that trained staff would know more than them.
Now then, ask the geek squad about watercooling and TCCD chips and I doubt they'll be able to answer it as well I or a few others here could.