Bar comes across in looks and enterprises as shrewd and determined operator on a global scale. That is scary for many men. While women wouldn't mind bask in the reflected glory of their famous men, men are more uncomfortable about deriving their status by being "the husband of". Another reason, Bar presents herself as so obsessed with her own image, that there can be hardly any competition there: she is so in love with herself, that there is no room for others. In fact, the kind of man this femme fatale needs is someone who would be mostly preoccupied with worshipping her: a toll order for any one, especially for male psyche.
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from the article: Israeli supermodel Bar Refaeli wonders why she's still single