Winning on Deity level is still a struggle for me. But I found one way to make a lot of gold is to improve a luxury, sell it to an AI and then let a Barbarian destroy the improvement. It takes just 2 turns to restore and the AI seems to have no problem paying for the same luxury again every 10 turns or so (every 5 or 6 turns if you're lucky and the AI is rich enough), rather than every 30 turns.
Is this considered to be an exploit? Are there any drawbacks I'm not aware of?
Is this considered to be an exploit? Are there any drawbacks I'm not aware of?