Natalie Portman claims actresses who go to Hollywood to get rich are no better than prostitutes.The 'V for Vendetta' star insists she only takes on roles based on their artistic merit and says she would never agree to be in a film just because she was offered a large fee.She said: "I don't want to ever be working for money because then you are no different to a prostitute."The screen beauty - who starred in the money spinning 'Star Wars' prequels - also revealed going to college was the best thing she's ever done.Portman - who once said she would "rather be smart than a movie star" - says her experiences at America's prestigious Harvard University taught her to have a life outside of Tinseltown.She told Britain's Independent newspaper: "I have the most amazing friends in the world, who are doing such interesting and different things, and are their own people. They are my support base along with my parents. They are inspiring and always doing different, interesting things so I remember how to be a person by being around them."Like, you can play a person if you are a person in real life. It's hard to be like, 'I just pretend to be a human being on TV!' So the most important thing about college is that now I really have a life and I've got that forever."