paint's always going to be expensive... so wipe that bird poop off the car stat!
Again, some things aren't worth fixing, and they build up. The fabric on my headliner detached. Quickly went from "foam slightly exposed" to "sagging across the width of the backseat". Car is worth less than 5 grand, would be almost 1 to fix. It's a good thing I didn't, because brake troubles cost about as much and were necessary to fix.
I think a lot of waste goes into maintaining cars cosmetically.
It's really important to have some "pride of ownership" in an older car, and fix anything that isn't perfect immediately- so they don't build up over time and make you feel like the whole vehicle isn't nice to use or own anymore.