Why Chinese girls till the beginning of the 20th century bandaged their feet?

In aristocratic families in China till the beginning of the 20th century, it was common the case of bandaging girl's feet. All the toes, but the big were tied to foot, after time the foot was deformed so much that woman couldn't walk at all. It was considered to be a good quality, since women from the aristocratic families didn't need to walk all the job was supposed to be done by their workers.

IMAGE: www.wikipedia.org
SOURCE: http://en.wikipedia.org/wiki/Foot_binding