It's not clear to me whether +20% from culture applies to only culture type wealth (libraries, etc.) or to the aggregate wealth. Hmm, have to re-test this.
Naval commerce and boosts to it from techs and temples is what usually turns out to be the biggest cash cow in my campaigns. Sometimes even a 3-region, 2 port province (with stacked temple effects) can generate in excess of 10K income per turn especially after the civil war when one can reduce global corruption via the empire government decision.
One trick with naval commerce is that one has to control all the ports that are located in the sea-zone(s) of the commerce province. Even an ally controlled port causes a significant reduction in the naval commerce income. An enemy controlled port (or enemy stacks present in the sea-zone) will have a dramatic impact.
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