We're social animals, and it's hardwired into us that, at some point, when everyone around us is making a certain decision, our own decisions become framed in that context: "Am I going to go *with* the crowd, or *against* them?".
There was an experiment done where a whole roomful of people with one unsuspecting mark would insist, as a group, on picking the wrong answer on an obvious visual test, like "Which line is longer?". With an obvious difference that 100% of individuals polled individually answered correctly. What they found was that about two thirds of their tested people in the crowd condition went along. One half of those people insisted the crowd had been right even after they were told it was an experiment, and the other half said they went along because everyone else was.
I always wanted to "go pentax" in 35mm because I loved the compact cameras and the beautiful primes, but when I was a pro I needed the availability of CaNikon gear and the service. Now I can wait and wait for a lens to become available...