The Goq – it serves 4 purposes that I’m aware of:
1) A woman will know when the floor is dirty because she can see it on her feet or feel it. She will make sure to clean it right away (a true balabuste)
2) Shoes get the floors dirty because they track in dirt from outside. See #1.
3) Shoes get worn out by wearing them. If she doesn’t need them then its wasting money.
4) Shoes imply going outside. Why does a woman need to leave her home more than once a month? See the Rambam.