I thought this whole thread was indicating those weren't sufficient freeze protection and relying on luck (Blanco hating on his favorite OEM). Unless I am mistaken opinions on this thread are as follows, bay heat isn't enough without doors, weep isn't enough without rail heat I am going to have to check with my middle school science teacher about freezing and the impact the starting temperature of the water plays in how long it takes to freeze.
Pretty sure there are plenty of examples of pictures of bays where the weep made an ice mountain from running continuously, but I guess with the reported logic at least you got to make $300 from the 6 cars you washed during your Alberta Clipper.
Depending on the area water is not always cheaper but what is cheaper is limiting your liability. Using the same logic we would be advising owners to keep their wash open even if the water supply to the building had significant leak or keep running a machine with a bad bearing no matter what else it causes to fail.
Sometimes the smartest decision isn't the easiest or the most popular.