EDIT: I just wanted to clarify that everything in this post is regarding the Midsummer Festival, not your standard quests and achievements.
Blizzard fixed the bug that was preventing many from obtaining their achievements. In the midst of doing so, they had to reset ALL QUESTS. This means you can go through and redo all the quests and get the gold again.
As I finished my last achievement last night I noticed that I could grab some bonfires that I had already gotten. This morning I noticed that Blizz made an announcement that they had to reset all quests.
(Level 80 gold amounts)
Same-faction bonfire: ~6g
Opposite-faction bonfire: ~13g
Sorry if this is common knowledge, I just figured not many will know that all the quests were reset. Sorry if you hadn't completed the achievements yet but at least you can get some extra gold in the process!