In Sorcerer's Stone, Vernon Dursley tells Hagrid "I AM NOT PAYING FOR SOME CRACKPOT OLD FOOL TO TEACH HIM MAGIC TRICKS!" This, and other instances, (particularly in Sorcerer's Stone,) lead me to believe that it costs money to attend. But the Weasleys put six kids through Hogwarts, and they were a poor family. They probably wouldn't have managed if it cost money to attend. Please help!