The average user doesn't buy an Apple computer either, or own an iPhone. Heck, even the average smartphone user doesn't have an iPhone. Yet Apple does quite well for itself.
You're only technically correct because of how averages work. Novice computer users make up a major part of Apple's demographic, and often times their products are more suitable. More specifically, there are a number of features in Mac OSX which simplify the file system for novice users, including "All My Files", "Date Last Opened"/"Date Added" sorting capabilities, and browsable folders straight from the dock.