Most productions works like that. You create a single thing, when that thing is done, the work is done. TV shows and movies doesn't need updates or maintenance (well except Cats ;) ).
When you hire a plumber do go in your house, do you keep finding him stuff to do to keep him on the payroll?
When you hire a plumber do go in your house, do you keep finding him stuff to do to keep him on the payroll?