Two words...chrome rims!
While many of you detest the look, OEM brake dust is FAR easier to remove from chrome than alloy.
I like the "time management" angle, but I for one don't clean brake dust off rims during what should be productive daytime hours. And for the little effort it takes, I usually dutifully clean off the brake dust when I go over the car in the morning and/or evening.
Mornings are best, since I would otherwise be wasting time looking at my watch, tapping my foot and glaring at the upstairs window wondering when my wife will finally get down here!