absolutely. when I worked at bestbuy maybe 5 years ago, there were a lot of people who would have bought a Mac if there were a cheaper 15" option. For many people, especially some older folks, 15" is the minimum.
On the other hand, there were also a few people who paid up for a 15" Pro just for the larger screen.
Older people like big screens because it's easier on their eyes. The pixel density of a Macbook is hugh, making the icons and fobt size look small at a default magnification.
Lots of PCs sold today are 14-15 inches but with 720P screens, making the icons postively gigantic.
On the other hand, there were also a few people who paid up for a 15" Pro just for the larger screen.