Or maybe allow rich families to put on a Tournament run by the family rather than a realm; to make it easier to use, it could even bypass tournament grounds (at significant cost)... After all, I'm sure a rich enough family could make a temporary tourney ground pretty easily with enough gold. In addition, a tournament in your honor is a perfect way to flaunt your gold and it gets redistributed to other players.
I think I really like this one. It has the perfect combination of flaunting your money to gain prestige while not being unbalancing as it does not directly affect any realm.
