Why does gwen stefani always have japenese back up dancers?

she's inspired by japanese culture. the harajuku girls aren't just her backup dancers, they represent her inspiration. "I'd get me four Harajuku girls to inspire me and they'd come to my rescue. I'd dress them wicked, I'd give them names. Love, Angel, Music, Baby hurry up and come and save me." those were some lyrics from her song "Rich Girl." she has a whole line of clothing inspired by the harajuku fashions. everybody acts like she keeps them in cages or something. i've seen videos and pics of her with them backstage and they seem like great friends. i'm sure they're paid well too cause they're really good dancers.