I work at Best Buy as a 2nd job (geek squad and sometimes sales), I wouldnt generalize too quickly. Ive helped at least 100 people get rooted as well as all the people Ive helped run leaked Blackberry OS', cook rom's for winmo, and jailbreak iphones.
I guarantee I could tell you waaaaaay more dumb crap Ive heard customers say to me than youve heard Best Buy employees say. For instance, the guy that when I asked his knowledge on pc's and he told me he was advanced however didnt have a damn clue on how to hit the connect button on his sprint card to get internet. Or the lady who when I told her that her router was blocking her mac address started yelling because "she didnt have a mac, she had a Toshiba". Then theres my favorite. The guy who bings his laptop in for a virus. Security tool is found on his pc and after explaining to him that what was showing as an antivirius software was actually a virus emulating windows security system. He told me he didnt need our help, he would just let the security tool program take care of it. He bought the program for 69.99 and the next day came back to tell us his credit card had been maxed out because, what do ya know, Security tool is actually a virus. His card was charged 20 times in one day because he told his credit card company he authorized that company.
The issue is 99% of customers dont have a clue about what theyre buying and once we start explaining its true features they get that deer in headlights look. Sales reps start dumbing down theyre approach to keep the average customer from getting confused and dumbfounded. Guys from sites like this go in with an ego because we are way more in tuned than even most cell phone developers. I guarantee one thing though, if you come to my store and make it known you have some knowledge on the product your purchasing you dont get the dumb downed version. However if you come in and start hyperventilating when I go into mounting and pushing files, you get the "Its like an iphone but better" speech.