There is an option on the User account Quota Config settings page that reads "Power User Enabled". This setting allows users who are in the 'User Group' Standard Users
to create extra profiles for themselves.
This differs from the User Group of Profile Admin
in that they can add extra profiles for themselves but not alter any details of profiles that other users have created.
If this option is checked, User Accounts belonging to profiles in this Quota will be Power Users that can create new profiles.