No offense, but you deserve it. You're exactly right, examiners have to read every word - what if you'd decided to answer the questions seriously, later in the paper?
You ought to be ashamed - you've wasted an examiner's valuable time, which could have been better spent marking another, worthier candidate's work. Someone else might be inadvertently affected by this, and subsequently get a lower mark.
The crux is, it's entirely fair that you should have to recompensate somewhere along the line, financially, in this case.
If you didn't want to do the exam, you should have just left, or dropped the subject. Instead, you just wasted not only time, but the school's (taxpayers', if it's a state school) money used to enter you for the exam.
Did you only keep Geography on so that you could get EMA?