Most people are sheep and buy without thinking...they see the pros using Canon so they buy one too, except the pro uses cameras and lenses costing thousands of dollars, and they buy a camera for just a few hundred expecting the same quality.
Another way that people are sheep is they buy something because they already own products made by, for instance they own a Sony TV, Sony VCR, Sony DVD, Sony monitor, Sony laptop, Sony clock radio, etc., so they buy a Sony camera without researching any other brands.
Personally I'm allergic to wool so I don't want to be a sheep! In fact when I was choosing my first dSLR I outright rejected Canon and Nikon since the controls on those cameras were so backwards and not intuitive. I do not regret my choice and even bought a second Oly dSLR. I'm the tech guy at a brick & mortar camera club so occasionally I have to help someone out with their Canon or Nikon camera, and I hate every second of trying to figure out those cameras!