Quote from : Harry Potter and the Sorcerer's Stone Book

You know how I think they choose people for Gryffindor team?" said Malfoy loudly a few minutes later, as Snape awarded Hufflepuff another penalty for now reason at all. "It's people they feel sorry for. See, there's Potter, who's got no parents, then there's the Weasleys, who've got no money - you should be on the team, Longbottom, you've got no brains.