It's not really a "trick" of the mind. People just don't realize the difference between the nominal (by electronic standards) sensory input they receive and the vastly different perceptions their brains construct. Most marketing is based on the belief that the world is as I feel, hear, see, and taste it. Reality is just a bunch of spherical rabbits in a vacuum.
I think it is more a combination of manipulative marketing, a lqck of understanding of how electronics work, and people's blind belief and trust that "they know what they are talking about and wouldn't lie for profits".