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I don't think all princesses are all very attractive but I would guess that its a high percentage.
I think the belief that many very attractive women are high maintenance can act as a consolation to many men who are unable to attract these women. Looking at a couple where the female is extremely good looking and thinking that there's a good chance she is very demanding rather than just feeling jealous can be reassuring in a way. I have no doubt of course that many attractive women are 'down to earth' but maybe they are more the exception rather than the rule.
I don't really know whether most extremely attractive women are high maintenance but I certainly think that the idea that they are can be reassuring in a way. As the saying goes 'the grass is always greener on the other side' and if you look at the disadvantages of a situation that before you wished you were in it then you feel better about your own circumstances.