I would love to know how old Harry and Ginny are supposed to be during this 'fic.
Why would Dumbledore restrict Harry from playing Quidditch?
If you're trying to parodize inexplicably-manipulative-Dumbledore or Ginny-as-skank 'fics, then I'm afraid you haven't quite managed it. You've depicted violence, but it's meaningless violence.
I think this story could move from badfic replica to badfic parody if you acknowledged the discrepancies but refused to explain them (You come close with the "If he'd realized how rich he was, he'd have hired his own private tutors."). Perhaps you could say something about, "Ginny, who had managed to afford breast implants despite the fact that her family had no money," or "Dumbledore who had eaten a maggot-flavored Bertie Bott bean and turned mean over the summer."