I've talked to Ladies into this. Responsible findoms do the budget and savings thing, with only minor requested gifts. I've even talked to women who won't let the guys spend any money on them until they've met financial goals like, "Keep your food budget this low, buy your wife a gift, put $XXXX into a savings account, and then and only then, can you buy me a present."
Irresponsible findoms will make their life really suck and it's more like a "high with crash" situation for the guys. Guys also seek to be "totally destroyed" (give so much money they can't pay rent and very little food for a month or many months) and may even not bother with the responsible findoms because it doesn't meet their fantasy requirements.
They consent to this with no extortion necessary. They'll even talk to MULTIPLE findoms, they're hardly monogamous about getting their needs met in this fashion.