1. Because 11,663 people have replied on THIS THREAD Apple Support Communities regarding this issue.
2. Because 36,724 people have signed THIS PETITION asking Apple to Replace or Fix All 2011 Macbook Pro with Graphics Failure
3. Because there is currently a Class-action lawsuit against Apple for this issue.
4. Even Canadians - the nicest, most polite people in the world - are filing their own lawsuit.
5. Because there is a website dedicated to this whole issue.
6. And a Facebook Page
7. Did I mention a Reddit thread?
8. Because I do not want to pay £500+ for something that was not my fault.
9. The "repair" that they have is just as ineffective.
10. Because they have the ability to recall and replace.
It's your move Apple.