At a quick glance at the Toys r Us website I found the following:
Barbie: I can be Swim Teacher
Barbie: I can be Soccer Star
Barbie Dream Stable Playset
Barbie: I can be Baby Doctor
Barbie: I can be Baby Photographer
Barbie: Play all day Zoo Doctor
Barbie: Check up Time Doctor Kit

Little kids want to play things that they are familiar with - teachers, actresses, models etc. I don't very often hear a little girl say "I want to play CEO - I'll be in my office doing paperwork"