I'll say this, I said it once, no matter how many times someone explains to me, I will never understand how the Culture Victory actually *Works*, I kinda wish they kept the system from Civ 5 where you just have to overtake the Civ's Lifetime Culture gain with Your Tourism Output.
All I know is 1000 Tourism means 1 Tourist or something...
Sadly for you, not always. 1000 Tourism could 1 Visiting Tourist. But also 400 or 4000. It depends on the number of Civilization.
A long time ago, I had the audacity to believe I could make an exhaustive guide about Cultural Victory. I completely failed and lost motivation since. But if you are valiant enough, you can read my
draft.
The Cultural Victory in VI isn’t that far from V. I will try to explain from a different angle: what I believe the game designers tried to do. I believe they tried to enhance the formula and fix some flaws. The problems of V’s victory is that early Tourism doesn’t really matter (or useless if you haven't met all Civilizations yet), and that it is basically a Duel against the most cultural Civilization in the game. Therefore, you don’t really need to put extra effort on modifiers with all the other civilizations with lesser Culture accumulation (since it is not the bottleneck).
The “Domestic Tourists” is roughly the same as the “Cultural Accumulation” in V. But since there is now a Civic tree, they included both the Culture accumulated and the Culture gained from the Inspiration moment. For example, if a mod awards you all the Inspiration moments when you start the game, then your Domestic Tourists will skyrocket. Then, that Culture value is divided by 100 and displayed as “Domestic Tourists”. I guess they did this because they didn’t like huge numbers.
But, there is one trick: Visiting Tourists. Each Visiting Tourist from a Civilization is reducing the Domestic Tourists count of that Civilization. Basically, you are stealing Tourists. We can witness this when using Rock Bands. It is an interesting mechanic, but has its fair share of problems. If a Visiting Tourist requires a fixed amount of Tourism, then your Domestic Tourists count will drop way faster on bigger maps since there are a lot more Civilizations that could steal your Domestic Tourists.
To fix this, they added a modifier. A Visiting Tourist requires a different amount of Tourism depending on the number of Civilizations at the start of the game. On Duel maps, a Visiting Tourist is worth 400 Tourism (200 × 2), while on Huge maps with maximum players, a Visiting Tourist is worth 4000 Tourism (200 × 20).
That modifier (number of civilization) is set at the start of the game. If a Civilization is wiped out, it would not update that modifier. So it is not recommended to completely conquer or raze a Civilization if you are aiming for a Cultural Victory (except in some case against a Civilization with way too much domestic Tourists), nor being reduced as a single city in a wasteland (if their domestic Tourists count is too low, you will have no Tourist to steal so that civilization is basically dead to you).
But now… How do they set the goal for a Cultural Victory? In Civilization V, you need to dominate all Civilizations by having more Tourism than their Culture. But this translates poorly in VI. If the goal was to have more Visiting Tourists than their Domestic Tourists respectively, the game would be endless. It could have worked by giving an overly potent Tourism modifier by the endgame, but since one of their goals is to make early Tourism strategy worth, they didn’t aim for this solution. Also because it would also end up as a duel against the most cultural Civilization anyway, making the process of attracting Visiting Tourists from any other civilizations insignificant.
So instead, they set the goal at having more global Visiting Tourists than the Civilization with the most domestic Tourists. Which is better, since you can attract Visiting Tourists from all Civilizations in order to beat the Civilization with most domestic Tourists. But there is one slight problem with that: IT DOESN’T MAKE SENSE.
For example, let’s say you are playing as France. You have a nice amount of 60 Visiting Tourists with the other Civilizations of your continent. For example 10 from England, Spain, Rome, Gaul, the Netherlands and Germany. You are about to reach the New World and met the indegenous Canadian and their french-speaking native and… you are suddenly culturally dominant over them. How? Because they have 50 domestic Tourists and you have 60 Visiting Tourists of course! It doesn’t matter if those Visiting Tourists are uniquely European, and none from Canada. You dominate their Culture even if they have never heard of you before.
So that’s why the Culture Victory is poorly understood: it doesn’t make sense, and it is not intuitive. It works well. Just as killing Wild Boars in RPG rewards Gold and Weapon, even if it doesn’t make sense to have Wild Boars yielding a wallet and a couple of magic staffs.
Once understood, I like the Tourism formula in VI way more than V. When we include how deep the Tourism victory is in VI, with wonders, great works, appeal, tile improvement, rock bands, religion, government, or all modifiers management, it makes that victory the one I like the most.