One of the advantages of Sponsored Magic is the ability to take on debts that bring on compels in order to do things like invoke aspects or deal with stress and so forth.  The downsides of doing so are pretty apparent for things like Hellfire and the like.  However, when it comes to being a Knight of the Courts, what is the difference?  Can't they compel you to do whatever they like, whenever they like anyways? 

Obviously not something you want to overdo, both for fiction reasons and for ensuring players have a good experience.  It just seems like a
big part of being the Summer or Winter Knight is that the Ladies of the Courts can force you to do their will already.  What is the point of debt for them?  It doesn't give them any additional control over the Knights that they don't already have.