One location can produce a number of variety of looks. Since the photographer is not having you stand in one single spot the entire time but is using all of the resources of the location. A single location can produce a wide variety of spots to shoot in and around so do not worry the photographers are experts at extracting the maximum value from any locations. In addition, it is better to shoot in a single location rather than picking up and moving to new locations constantly which can break the rhythm of the shoot and result in sub-par photos. Even professional models prefer to stay and shoot in a single location for shoots that are not more than 1 hour.