Question: Ron's wand gets broken, and for the rest of the year, he has to use it even though it doesn't cast spells properly. Why doesn't the school just get Ron a new wand? His parents can't afford one because of how expensive they must be, but surely one of the teachers could take him to Ollivander's and help him get another one.
Answer: It's not the school's responsibility to provide equipment for students. It can be humiliating for a student and the family to receive charity. It also sets a precedent for Hogwarts having to supply any number of things for students, and creates a situation where they could be taken advantage of. Realistically, this is a book plot point. It may not be logical, but the story would not play out and end as it does if Ron had a proper wand.
Answer: I agree with what RayWest said. Another possible factor is that Ron damaged his wand when the flying car crashed into the Whomping Willow, which upsets the Hogwarts staff and Ron's parents. I can imagine Mrs. Weasley wanting him to deal with the consequences of his actions for the rest of the school year.
Good point, and Ron, in addition to being in trouble with the school, also got his father into hot water with the Ministry of Magic over the flying car. I can't imagine, after all that, Ron asking anyone to get him a new wand. I doubt he even told his parents that he broke it, which would further anger them.
raywest ★