I think you'd be hard pressed to make any money when so many "companies" are already working from their front rooms and the market is pretty well swamped!
Part of my job is to repair large format digital printers. Some of which are used to produce wraps for cars, vans and buses. They are like the ones you see on SKY vans. I read a thead on here recently from a guy who found that it was cheaper to wrap his boat than to paint it. I have wondered if there was any milage in that as a service.
Allan