I've seen references to something similar in home remodeling - required paint and trim are stored in a closet during the work, but that closet itself never gets

I've seen references to something similar in home remodeling - required paint and trim are stored in a closet during the work, but that closet itself never gets repainted. When the homeowner says "hey, you missed this!" they get the option of a discount and doing it themselves or the contractor sending someone to use the materials already on site. People who complete it themselves have a higher feeling of accomplishment because they were involved rather than simply hiring it done.