My hometown has most of its shopping plazas and stores off of one large road. Some of the plazas don't have big signs telling you what stores are in them, so they hire sign spinners to attract attention from that big road. There have definitely been times where I saw a sign spinner and thought to myself, "Oh, I didn't know there was a ___ in there." So at least in my hometown, it's a good way for businesses to let people know that they exist off this main road. But I'd have to imagine that's sort of a unique situation (the lack of visibility/stationary signage).

Fine/thin 2c/3a, Low-Medium Porosity, Dry!