I definitely got a chuckle out of the ad; thanks for posting it.
Several years ago, on my very first visit to CompUSA ever, I couldn't even get their "printer expert" to check to see if he had any Apple Stylewriter II-compatible ink cartridges because I was completely unable to convince him that the StyleWriter was an inkjet printer rather than a laser printer. He literally refused to even look into it because he was sure he was right (and he was definitely very wrong). I know basing my opinion of an entire store on one bad experience isn't very fair, but I swear it pops into my mind every time I enter a CompUSA.