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Well there are three factors. Your rank on the leaderboard, what place your alliance was in, and your reward tier shown in the PvP window. What were your stats?
You arent really playing in the campaigns for the end reward, it is just kinda a small bonuses. The main reward and goal is what you get during the campaign when your side is controlling territory and scrolls. Thats the bonuses you get that make your character stronger, along with gold income bonuses and exp bonuses.