Dell has turned on quite a few consumers to the AMD name, as has HP. The average user can't tell a difference in top speeds, but they can see the difference on the sticker price. After all, bottom dollar is bottom dollar, especially when the performance is basically the same.
My mom doesn't know the difference between Intel and AMD. She knows Intel makes computer ships, and has heard of AMD. Her old computer died (an Intel, but it was a mobo failure), and I have an old 2400+ box I was going to use for Linux. I told her I would fix it up for her, but it was an AMD. Her response was to ask if it worked, and said, "That's good enough for me." most consumers have the same atttitude... "If it works and gets the job done, it will do."
But, yeah... when I bought my first AMD box I hardly knew a thing about them. I have since learned the wisdom of taking the path less traveled.