As minor as this is, it would probably bug me as well.
I originally got a space gray 5S, but a week later exchanged it for silver. I hated getting rid of that phone, because the color was gorgeous, but I wanted white again (my 4S was white). It really hides not only fingerprints, but small imperfections and scratches, especially around the edges. I guess I'm just not used to having a black phone, I would literally wipe the screen every 30 minutes with a cloth to clear the fingerprints, and the fingerprints on the home button, horrible. I had to get rid of it.
But yea, it sucks going into a store and trying to replace your phone when you have a small imperfection, because inside you feel like everyone thinks your crazy, but you have every right to want something perfect when you just got it.