You have enough clothes to wear a whole month without doing laundry? Gee. My entire wardrobe is maybe 4 loads, counting all seasons, and I think I have too many clothes.
Because it's an annoying job and no one wants to do one more load than they think they have to, so they fill it to the top. If you think four loads is a month's worth of laundry you're either overloading your washer or re-wearing a lot of dirty clothes.