I think that some of the Pricesses could become walking nightmares in term of money and spending, if they divorce their princes / lavish style of life. What do you think about Mary D. addicted to heavy shopping or Mette-Marrit, for ex ?
Personally I don't think Kate Middleton will be spending like crazy (she recycles a lot, and is not so obssessed with clothes, only her hair and boots
) and she comes from a wealthy familly.
I think Mary has been socking away "her" money while spending Denmark's on herself - plus pocketing the money from resale of her clothes. I would bet she gets money from staging photos and releasing stories about herself as well. It wouldn't surprise me if she has a hefty bank account - or more than one - ready. This would be in addition to whatever allowance she would get as the divorced wife of the Crown Prince and mother of the heir. However, I think the first few years on her own would be a shock as her allowance would be quickly spent then over-spent, and she'd have to dip into capital to cover it.
Mette-Marit is a grifter, and grifters always get by. She'll plead poverty and hang around looking lumpy and forlorn but will end her life on the dole - albeit a princely one - just as she has all her life.
Kate Middleton will be fine - I bet Mommy has been making sure she's financially provided for and has been shrewdly investing for her. Although she's no Sarah Ferguson, the BRF are certainly savvy to the consequences of immediate payouts of money and the precedent Sarah established of blowing it all then wheedling for more, selling herself and her ex. (From what I hear, more than once, Sarah quite literally sold her own person to certain wealthy men who were looking to put a former Royal Duchess in their 'tapped that' list.)