Gadzooks, I was in a hurry so I left out the important parts in my idea.
Guild founders AND admins will get a vault, where they can store their clintz for the guild's uses. For example, the guild founder can allocate these clintz to members , like a stipend in an army, if they're dedicated to the guild. (AKA active).
To increase the amount of clintz that you can store in the vault, you must pay lots of clintz to Kate, like 100.000 for a 25.000 clintz limit increase, and it gets more expensive as your vault gets bigger.
Also, to prevent the abusing of the alliances system, there are "relationship system". From the very start, all guilds are neutral, but, if they wage war, then their relationship will turn into "bad", then "very bad", then finally "hostile". As your relationship worsens, you can't secure an alliance and in order to get rid of that, you must reconcile by paying clintz to that guild.
The amount of clintz needed to reconcile depends on your relationship.
You can also improve your relationship to other guilds by donating cards and clintz to other guild's vault. That's right, the vault can also store cards.
....However, I think that the biggest problem is not with the economics or gameplay, but popularity. Why not introduce UR through iPhones? Not by making a UR app, but by releasing a mini game based off UR characters, with a cheap price, so that new customers can relate to them.
An Angry Birds-esque game starring Hawkins