Sometimes, users in Joomla! may want to use the same of very similar profiles in different ways. For example, in my case I am thinking of:
Wanting to use the same profile edit mode for different groups or site locations and therefore with different return and cancel pages.
Wanting to use one or two extra fields in a profile for some specific group (i.e. class for alumni).
Wanting to use one profile for users and the same profile plus a few additional fields for administrators.
There are many instances where it would make it much easier if the same profile couldl be copied to a new name and then edited.