There is a huge percentage of the people that don't even know that AMD even exists. Like someone else posted earlier, people think that the "CPU" is actually called the "Pentium" Then again a lot of people refer to the "PC" as a "CPU" or a "HARDDRIVE".
I had a guy who was interested in a PC for his son for Christmas. His son is an avid W.O.W player. I recommended we build an AMD system.
He was like, "AMD"? What is that? Is that a type of Pentium? lol... I tried to explain the benefits AMD has over INTEL in gaming and it just went in one ear and out the other. But, he was stuck on Pentium 4's and refused the AMD build. He didn't care about the Price/Performance difference. So I built him an Intel/Nvidia system.
A few months later, he called me. He had been reading articles online about AMD vs. INTEL. Then he has the nerve to ask me if it's possible to convert over to AMD. I said sure... But my labor time is going to be double the cost. He decided to stick to Intel.
If you're paying someone to build you a PC. Listen to their advice. They probably have much more experience then you do.