This action of setting the profile type "copy" as the new default creates trouble if the user is not aware of the current action. I would suspect that few users would prefer the "copy" to be the default and if so, they could more easily change the setting rather than remember to change this default setting back to the correct profile type.
To test this process: Open a profile type>Save Copy of default profile type>see new copy in list view is set to the default. In my case, I am testing new profile type settings, creating new profile types based upon my default or simply testing a new configuration in custom tab.
Todd