Part of it may be that, when a girl's been the President's mistress, anybody who would actually WANT to date her, she feels is "beneath" her. I don't think she can see herself going out with a McDonald's manager or a plumber, and the men who are rich and high-status have better options than settling for her.
True, and she’s from a wealthy Jewish family, so unlikely she’d be interested in “working” types.
And as you say, guys from similar background have better options.