Most people want a house that is the same or very similar to others around town. You want to be unique on your block but otherwise the same as houses a few blocks away. Just enough that you don't try to get into the wrong house those first months after moving in.

Houses that are the same as ones across town are cheaper as the builder has experience with it and knows the tricks to build it with less labor. They also are designed with years of feedback about what other like and dislike. They don't have weird corners that are not usable because after putting things in that is what fit.