Earlier quoted context omitted.
> still paying for custom paint schemes or colors Because you need to be able to recognize from a distance, hey that's a city bus. Not a charter bus. Not a school bus. Not a long distance bus. And buses aren't usually wrapped with advertising. It's usually just a banner on the sides below the windows. Some ad campaigns pay much more money to extend it over the windows with that mesh material. But that's generally a s…
Buses typically have lit signage indicating their route number or next stop, it’s kind of a dead giveaway and paint job can be ignored
The paint job really is important because it's vastly more visible. It also often does things like distinguish between local buses and commuter buses, depending on your city.