I think they still pay princesses in the coin-of-the-realm.
(The exchange-rate for realm coinage is in constant flux).
Although its tough to be sure in all cases, I think that many royal personages may be stay-at-home-mums (in the off-season), assuming, of course, that their respective princes can be charming enough to bring in enough realm coinage for a multi-royal household.
This discussion should really be taken up with the lessor beings about the household.
Ladies-in-waiting, crumpet-browners, armor-polishers, and press agents can be valuable allies to enlist when it comes to spilling the beans about secret royal stuff like revenue acquisition and shoe size.