I am considered the resident computer “geek” by most of my family and friends so they usually ask me to accompany them to CC or Best Buy when they need a new box. I’m constantly amazed by the BS these salepeople try to push on people. I’m sure many on this board have had similar experiences.
They probably believe the BS themselves, because even in today's IT market, if they actually knew what they were talking about they wouldn't be stuck working in retail.
FWIW if you really need product knowledge from staff, do your shopping when the part-time workers are there. A kid in high school works there because he's interested, while an adult works there because he isn't qualified for anything else.