Is there any advantage to using multiple cameras in a rotation?
Makes sense that if you have a collection of cameras you want to be sure that there are on working order so putting film and going for a stroll will ensure that they are free of problems, is it there any other reason?
I collect cameras just because I enjoy them as objects and I enjoy the history behind them. I don't necessarily have all of them for some specific photographic purpose and think of it as an adjacent but separate interest from my photography. Many of the cameras I have do end up getting used at some time or another for some specific purpose that a particular camera just happens to work well for because of its design or whatever I'm trying to do. For example, I've found this Grafelx (and similar models and sizes) to be pretty ideal for a lot of the work that I've done with homemade optics as I mentioned. They're easy to strap the lens to and being an SLR design means that I can directly see what an optic is doing which helps me judge how I might want to modify it further. The focal plane shutter also means I can experiment with all kinds of lenses without worrying about a shutter. Of course there are other cameras that you can do the same thing with. I just like this one for its own reasons. The camera body is also easy to modify being a box design and made of wood. At one point in the past, I removed the entire back assembly where the film gate is and the holders attach and I grafted on a modified Fuji PA-145 that allowed me to shoot the old Fuji FP instant films. It was just good for that particular experiment.