I think you underestimate how little economic pressure matters when people are up against an invader who attacked amidst negotiations for bogus reasons, threatened total annihilation, and killed thousands, including a school full of children.

And, to add on, how much more it matters when a very rich population didn't sign up for this at all and has no vested interest in "winning" at cost.

This is a population that absolutely despises their government. At least a very large percentage are in that category. I think you misunderstand the reality on the ground