Big Lee

As the owner of a rather fetching set of Gold wheels I thought today I would take 1 off & give it a good clean, both back & front.What I need to know is why the hell don`t subaru paint the whole wheel?? as you can see through the large gap between the spokes the "overspray" looks bloody awful.Has anyone painted the inside of their wheels & if so what paint did you use? and also while I`m having a winge why do the calipers corrode so easily & also look sh1te?? These little things do make a difference to the look of the car I think.
Any ideas?