I agree that so long as the exploit remains in the game, its use is always optimal and it's senseless to argue against using it when finish time is what counts in the final end. To you it may be the *only* thing that counts; but many people have other things on their minds even while they compete. The less things there are that remind people that AIs are just numbers, the better imo. It costs the competitive players almost nothing and adds a huge amount of fun for the role players.
Now, about *how* the exploit should be 'fixed': there are a number of ways, all with pros and cons. I can think of three right off the bat, some of which have been touched upon:
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1) Diplomatic penalties.
Pros: Exploit mostly removed, while making it 'believable' (you can do it but with consequences, as in the real world).
Gray area: Depending on the severity of the penalties, there could remain situations where the exploit would still be optimal to use. With a limited number of utilizations (due to mounting penalties), it can be argued this would add strategy to the game (I hereby coin the Civ acronym 'OPOB' for all time - 'Optimal Point Of Betrayal' ).
Cons: Some people would consider the thing above a con instead, preferring the exploit to be altogether impossible. With severe enough penalties this could be done, but it starts to feel gamey in another way ('what, I broke one deal and now the WHOLE WORLD hates me FOREVER??!1').
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2) No lump sum trading possible (for AI-human trades, at any rate).
Pros: Clean and simple at first glance; exploit totally impossible.
Cons/Gray area: If you need gold urgently, you have no way of getting it. Some would argue this adds strategy: you must plan in advance to have enough gold on hand for all your needs.
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3) Luxury and gpt deals persist through wars.
Pros: Fixes the exploit, alright. (Unless they have one city and you can quickly destroy them, thus cancelling the deal. But how much could they have to trade anyway in such a situation?)
Cons: Totally jarring role play wise, perhaps even more so than the current mess. I mean what two countries have historically continued trading during war, barring black market trade? I'm sure a few examples could be found, but overall the notion is preposterous.
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4) Other ways that haven't been thought about yet. Ideas are welcome; maybe we should make a poll about this? How many want the exploit gone and what are people's favorite remedies?
Edit: One additional way is making deals give a mandatory period of peace... But even if it's not the full 30 turns that a trade deal lasts, this would be very exploitable by humans - when you see the AI coming with 50 units, just sign a paltry deal for Sugar vs 1 gpt and be safe for ten turns... After that sign another, and so on ad infinitum. Clearly this 'fix' brings more problems than it cures.