Since elementary school, I've been told that things had to match. If I wore Sean John pants, then I had to wear a Sean John shirt. If I wore anything Nike, then I had to have the matching shoes to correspond. This was a mindset that I held throughout most of my life.
Marketing and customer loyalty are two powerful things. They can make minor improvements in gadgets seem great, and major advancements to-die-for. In the world of photography, many camera owners feel strong allegiances to the brand they use, fiercely defending it as their own, and even going on the offensive to belittle other photographers who shoot under a different banner. This kind of customer loyalty does strange things to how the "fanboys" perceive the quality of their camera gear.
Ever wonder why certain people always seem to engage in meaningless Canon vs Nikon vs et al. camera brand debates at every opportunity? A recent study conducted at the University of Illinois has found that the more knowledge and experience you have with a particular brand, the stronger your self-esteem is tied to it.