Now that the PTW MSDG is over (dead rather), I will announce the exploit:
It was this:
In vanilla Civ3, and PTW, you could gift the AI 9,999,999 gpt. Sure, you'd lose a unit or something every turn, but...
For each turn you wait, the AI gets that much more gpt. The trick is, (especially early on, or with their last city), declare war on them (perhaps even after the GPT deal expires, or before they contact another civ), and take their cities. You'll be getting hundreds of thousands of gold, if not millions.
Inflation.
This was fixed in C3C.
Nobody (the user) guessed it earlier in this thread. I just didn't want to confirm it right then and there.