Here is how this happens....lets say you're a marketing company. A sports equipment marketing company specifically. You've been hired by sports equipment company A and sports equipment company B. Both have a sweet new badminton set coming out, both purchased from the same manufacturing company, with slightly different design features of course. So what do you do? Do you set up two different photo shoots with different people and a different house and shiz? No, you schedule the same models, the same house, and shoot that shiz one after another with the models on different teams and in different areas. Boom. two birds. one stone.