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You're right, there's a category that likes her books. I was wondering the same thing till I met someone who was crazy about Danielle Steele. Her marriage was basically over, she was an emotional wrack and I guess this was like a refuge to her, gave her a few hours of dreaming about happiness. Can't explain otherwise. Life is very different though, we all know that.
Don't waste time with her books :)

ooooh, that is a tragic explanation of a fan :( but probably not too off the mark. I think Steel's books might give some people unrealistic expectations about romance. The mistress involves multiple billionaires and really successful artists, all who shower their women with lavish gifts and attention.