The phrase “tools not jewels” is a useful way to view your possessions. I like to color match components on my bikes and keep the clean, but I try not to stress too much about when they pick up rock chips to the paint or scratches from being locked to a bike rack. Being able to gaze at a pretty bike doesn’t do you much good if you never ride it. (That’s no reason to buy an ugly bike though, or never wash it.)