Game of Thrones has big budgets and big ratings. The budget per episode for the HBO series averages $6 million. HBO. The world of HBO’s “Game of Thrones” is expansive, and expensive. There are multiple realms, dozens of characters, constant plot twists -- and dragons.he agency has reportedly paid $15.3 million of the show’s budget over the past four seasons in exchange for an estimated $108 million that the show’s production brings to the area. And the budget is not the only lavish thing about the “Game of Thrones” production.