I'm not sure that the NAD player in High Fidelity is much of an indication of anything other than NAD's interest in placing products in films. I think the most blatent of these was in "The Italian Job", where the nerdy computer geek (he liked to be called "Napster", as he claimed the whole Napster thing was stolen from him) lusted continually over some NAD HT Receiver.
Of course, at the end of the movie once Napster was fabulously rich thanks to a successful gold heist, he managed to buy the aforementioned receiver along with large speakers and proceeded to play music so loudly that it blew the clothes off the women he brought into his place. Now, that was a classy movie!
Talking of product placement, though, I noticed on the closing credits to "House" the other night they mentioned SOTA turntables.
On the topic of celebrity audiophiles, sometimes manufacturers will mention which celebrities have chosen to use their products. I have no idea whether this is indicative of anything at all (maybe the gear was given away for advertising purposes, maybe the extremely rich celebrity bought it because he/she could, or because it looked nice...I have no idea. But perhaps it's because the celebrity cared, and thought it sounded nice). Anyway, the most recent example of this I saw was on the Butler site. They list Clapton, Elton John, Eric Johnson and Billy Gibbons as people who use their gear. But as they also list Pink Floyd, they might just be talking about professional use.
Chad