Mainly because we are working out of our spare bedroom. If it wasn't for my husband, I would not be able to move them around. They are just really hard to move once they are all put together. I mean, I understand that there is no way to make them any less heavy but for the space I have to work with, I wish that maybe I would have chose a different style or go the economy rack way. Occasionally we have had some ASF hoppers get loose and they get trapped under there. It is a nightmare moving the racks to get to them or moving them for any reason actually. Since we have carpet for flooring, its not like I could put them on rollers to help either.