You have already scuffed it up. It is a commuter bike. Is it worth it to worry about more scuffs?

Personally, I worry very little about the apperance of my commuters. Actually the more beat up the better. With the stuff I fit my bikes out with, they are easily worth 5-10X the rest of the bikes locked up around them, but I don't advertise that.

I like easy riding, reliable bikes for the distances and frequency I commute. That requires spending money for some good parts or at least spending money more frequently for ok parts.

Don't go flashy in possible theft areas though. I learned that lesson. My bikes are uglified, but boy, do they roll nicely. If I add up what I spend on my commuters, it is still as expensive as get out, but at least they don't look it.