The cardboard tubes on dry cleaner's not only don't last very long but have a sticky coating which keeps your pants from slipping off the hanger but after a few uses becomes covered with lint, hair, etc. (basically gross!)
Removing the cardboard tube leaves you with a not very useful partial hanger.
Here is a quick and easy way to convert this into a hanger for lightweight items such as camisoles. My camisoles need hangers with notches for straps and those are harder to find and more expensive than just plain plastic hangers.