Darkroom supplies don't actually take up much space. When I had a darkroom, I used a small walk-in closet. Plenty of space for my stuff and some misc. storage as well. A photographer will, however need LOTS of storage space for studio equipment, particularly if he can't simply leave it at the studio. Maybe he rents space in a "hot" studio, and must remove his gear when his time is up. I could easily envision a storage locker being used for studio gear. And not a small one, either. Think about all the stuff that takes up quite bit of space, and he can't just stack it into a corner of the studio because the other photographers are careless slobs who will wreck his stuff or steal it. OMG, backdrops, light stands, lights, reflectors, posing props, camera stand, computer stand, more lights and more stands, electrical cords, fans, etc. Of course, he has to own a large enough vehicle with which to haul it all back to the studio.