If you care about the paint job on the car, do it. I got fed up touching up the chips and I don't want to let them untreated because they will rust in 1-2 years. I swore, for my next new car, I’ll do it from day one of ownership.
I just did it today on one of my cars. The hood and front fenders bra was $250+tax (07 Mitsu Outlander).
If the car is clean and you look from close proximity you can see the line, but otherwise no. I had one previous patch removed and it did not damage the paint.
If you are in GTA, there is a place called 3M TrimLine Metrowest on Dixie and Drew. This is a place used by people on various car forums.