Okay... here’s the first extended entry.  Not sure how meaningful...but...
Why can’t people keep their wheels clean?  I’m sitting right now in a restaurant lot, looking over at an otherwise nice car, and it’s front wheels are almost black!  ...Brake dust!
How can so many people with newer cars take so much care with every other part of their car, and ignore the wheels?  This car next to me is somewhat sporty.  They've gone to the expense of buying after-market mag wheels, but can’t seem to find the time to clean them.  Or maybe they aren’t even aware of how they look.
Disc brakes are far superior to the older drum systems they’ve replaced.  Because of the added expense, most cars only have the disc brakes on the front wheels (where most of the braking work is done).  The rear wheels still have the drums.  That’s why you’ll see cars with black front wheels and shiny back wheels. 
 I wouldn’t want to go back to drums just because of the dirt discs make.  Discs just do a much better job. But it really shouldn’t be an issue.  I’ve always considered the wheels part of a car wash (as well as tires).  I wouldn’t expect most people of going to the extent of putting a tire treatment on (I only do that a few times a year).  I can be a real automobile perfectionist (when it’s warm enough). Probably something to do with my father working at a new car dealership during my formative years.
Okay... you don’t have to wash your tires.  But, please... people...  look after your wheels!
Wheel cleanliness is next to ....
;-)