How does HBO make money from Got?

Related questions

1. How much money has got made?
2. Where do they film Castle Black?
3. Why did Game of Thrones get Cancelled?
4. Is Game of Thrones a real story?
5. Is Game of Thrones based on books?
6. How rich is George RR Martin?
7. How does HBO make money?
8. Where is Got supposed to take place?
9. How do TV shows make money?
10. What country is Game of Thrones from?

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20. #billion