Is Illwinter (ritual) good for Jotunheim?

[Firebreath]

They're certainly the nation that can cast it easiest with blood/water starting mages, but will it actually have a positive or simply a less negative effect than everyone else in the game?

Consider the following scenario:

I'm playing as Jotun-niefelheim, with a natural dominion of cold+3. I currently have almost the highest income, so an income reducing ritual would affect me more than most....

Illwinter makes everything colder (good), also reduces the income worldwide (is that because of the extra cold, or is it extra?), and it also increases unrest (surely that can't be good for my expensive niefel giants, and even more expensive blood hunters.

Thanks