Maybe add something that is recurring, expensive, that we can spend the money on? Like I don't know, a charity for elves? Or a server room for Android? Or buying enormous amounts of supplies for Nia and Maria, or the Bear Clan? How about funding the college degrees of the girls? Maybe build a giant robot to fight the queen with lasers and missiles and a huge watercannon that pulls the ocean water around the island.
After a point the money just keeps piling up and up and up with literally nothing to burn on.