Intriguing. And may one assume that if the student so taxing the school's resources is a halfblood, his foster-family would be held to account?

Madam Pomfrey is a skilled and experienced Healer. One could as easily ask why her ministrations have not proved effective for the unfortunate who, despite intervention, fails to respond - and in such a case, is it truly the shortcoming of the individual, or an indication that the cure is insufficient?

There is something to be said for disciplining one's reactions to stress; however, when a child develops a chronic condition which no amount of magical healing can undo, perhaps it is a sign that more stringent measures are warranted. In which event, an additional penalty would only worsen the ailment, rather than aid in the cure.