Please help me to answer this question in at least one paragraph.

Sometimes actors, directors, and producers are asked to take a lower salary up front and instead receive a percentage of the films overall gross profits (from box office receipts, DVD sales, and similar revenue streams). Why might the film company propose this arrangement? Why might the actors, directors, and producers accept this arrangement? Would this type of arrangement (lower salary up front with a percentage of the films gross profits later) make the budgeting process easier or more challenging? Why?