The shiny side is buffed and painted, the inside of the wheels isn't.
Why? I guess you'd have to ask Porsche that. Probably the same reason that the inside of the trunk(s) underneath the carpet isn't finished as nicely as the outside of the car. Cost to some extent, and what's the point? You're not going to see it anyway.
I would agree that it's nice to look through the wheel spokes and see a clean wheel, but there's no sense going nuts over it.
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