The role of marketing can be understood as, or is analogous to, certain activities of a successful theatrical production.
Marketing consists of all the activities it takes to secure both a stage or meeting place and an interested audience for the play, not to mention producing the play itself. I.e., the good old 4 P’s: place, promotion, price and product.
Sales, however, is the presentation of the play with the intention of moving the audience emotionally. That’s why they will buy tickets… to feel something, not to sit in an uncomfortable auditorium with a thousand strangers.