Given the chaos, etc in Elinie I think that all we can say for sure is that
everyone is going to be losing

The LPA just wound Robhan up to the point that they turned him from reluctant neutral to open enemy and things can only get ugly now.

Robhan historically lobbed Elinie a bless or two a season to stay in their good graces, amusing as it was sounds I was really worried about the LPA getting Rashid to chuck me out of the realm at the start - not to mention that Rashid seemed devout enough to do it out of love for Avani anyway - blessing seemed a cheap way of staying in his good graces, and since I have a couple of reasonable size holdings it didn't really cost much. Robhan's made a few hints on payment since, but Elinie's so poor right now that he can't really put any pressure on.
I'd expect Viktor to crunch the numbers in Mhoried and laugh insanely if I suggested being paid for some of the provinces - he's ignored our treaty point on payment since ascending...
Personally my view is that everybody benefits from BTHL, so everyone should contribute (look see! flying piggies! hear the innocent halfwit speak and laugh!). The question is really balance, I'd expect the nobles (not just the ruler) and the guilds to cover a good part of the cost, maybe all of the marginal cost in a large province, but wouldn't expect any single regent to go beyond half unless they are really dominant - at which point you can't really make them do anything. A temple expecting the ruler to pay more than the ruler benefits is on a hiding to nothing though in my view.
On the numbers btw, LPA could bless 3 provinces and almost break-even once the place is up and running again, they could easily have tapped the Aegis until then but they weren't interested enough in Robhan's arguments to take up his comments on that side. Not entirely surprising as Robhan can be insufferably patronising with the LPA and was furious with them for betraying him and ruining the realm.