I'm not sure this is correct. I remember in one episode of Mixergy, Andrew Warner said something to the effect of "X was the most expensive, so I bought it thinking they'd be the best and they sucked! Don't buy x."
You're missing the fact that nobody is denying that economic principles are a bit noisy in reality, and nobody's denying that demand curves are shaped by marketing and that the price itself is part of this.
Had X been cheaper, he wouldn't have bought it.
What am I missing?